Thanks for your prompt reply, I appreciate it!
I did a bit more research about 讓球主客和. It seems that most of the terms I gave here are set terms used by the HKJC for betting (maybe they'e got some betting slips specifically used for this).
The jockey club website gives a detailed explanation about this term: http://is.hkjc.com/football/info/ch/betting/bettypes_hhad.asp
投注經讓球調整後之主客和賽果。
較強之球隊會讓球予較弱之球隊，勝負由正式賽果加上讓球作調整決定，讓球數目為整數，例如一球、兩球、三球或如此類推。你可依照調整後之賽果，預測主隊勝、賽和或客隊勝。
That's the explanation they give
The cantonese (not standard chinese) wikipedia is much more specific and has lots of explanations for this and other similar jockey club betting terms
http://zh-yue.wikipedia.org/wiki/%E8%B6%B3%E6%99%BA%E5%BD%A9
They translate t 讓球主客和 as (Handicap HAD/Handicap). Handicap betting is where the weaker team is given an advantage which will be taken into account with the bet. This term is also used in bookmakers in england (I'm not sure about the US), they usually have forms in the bookies to fill out when betting on this:
【讓球主客和】／【讓球】(Handicap HAD/Handicap)[編輯]
設過關，最多過八關。
就球隊嘅強弱而開讓幾多球做盤口，分「讓球主客和」同埋「讓球」（俗稱「亞洲盤」），以馬會公佈嘅讓球盤口做準，盤口嘅叫法係「讓幾多球」同埋「受讓幾多球」。彩金按賠率計。
讓球主客和，係要買中喺讓球整數下賽事嘅勝方或和局而派彩；以下面嘅模擬盤口為例：
強隊（-1） 對 弱隊（+1），即係強隊讓咗一球畀弱隊，假若最後賽果係1:0強隊贏，喺強隊要減一球嚟讓人嘅情況之下，賽果就會設定做0:0，因此一定要押注和局先至有彩金，唔係就輸，如此類推。
讓球（亞洲盤）就冇得買和局，只可以買主隊或者客隊贏，盤口亦唔一定係整數。若果計算過讓球盤口嘅結果出現和局，投注嘅金額係可以退返部份或者全數，行內稱之為「走盤」。以下面嘅模擬盤口為例：
強隊（-0/0.5） 對 弱隊（+0/0.5），即係話強隊要讓零球同埋半球畀弱隊（術語叫「讓平半」，如此類推；「平」即係平手），因為其中有兩個讓球盤口出現，所以個投注金額就會一分為二。假若個原本賽果係0:0和局，強隊要減零即仍然係和局，咁一半投注嘅錢就可以走盤，而另外一半盤要減半球嚟計，因為入球數係冇半球，只係想攞個中位數嚟做指標，咁弱隊加半球已經係超越咗零嘅正數，故此會當成弱隊勝出；用以上呢個例子，如果用兩百蚊買弱隊贏嘅話，咁一百蚊就會退返唔使輸，另外一百蚊就會乘以弱隊嘅賠率嚟收派彩；而如果原本賽果係弱隊贏0:1或更多嘅話，咁直頭可以收晒兩個盤嘅派彩，即係買幾多乘幾多；如此類推。
Other terms include: 1.1.1 【主客和】(Home Away Draw)
【半場主客和】(First-half HAD)
【讓球主客和】／【讓球】(Handicap HAD/Handicap)
1.1.4 【總入球】(Total Goal)
1.1.5 【入球大細】(HiLo)
1.1.6 【入球單雙】(Odd Even)
1.2 過六關投注方式
1.2.1 【波膽】(Correct Score)
1.2.2 【半全場】(HaFu)
1.2.3 【首名入球】(First Goal Scorer)
1.3 固定過關
1.3.1 【套餐主客和】(Section HAD)
1.3.2 【六寶半全場】(6 HaFu)
1.3.3 【孖寶半全膽】(Double HaFu Score)
I would imagine that 孖寶半全膽 translated as hafu is meant to be using the english "half" as a loanword.
These terms are common in newspapers, however they seem to be "jockey club specific" and unless someone is familair with betting in the HKJC then they may not know them!
I did a bit more research about 讓球主客和. It seems that most of the terms I gave here are set terms used by the HKJC for betting (maybe they'e got some betting slips specifically used for this).
The jockey club website gives a detailed explanation about this term: http://is.hkjc.com/football/info/ch/betting/bettypes_hhad.asp
投注經讓球調整後之主客和賽果。
較強之球隊會讓球予較弱之球隊，勝負由正式賽果加上讓球作調整決定，讓球數目為整數，例如一球、兩球、三球或如此類推。你可依照調整後之賽果，預測主隊勝、賽和或客隊勝。
That's the explanation they give
The cantonese (not standard chinese) wikipedia is much more specific and has lots of explanations for this and other similar jockey club betting terms
http://zh-yue.wikipedia.org/wiki/%E8%B6%B3%E6%99%BA%E5%BD%A9
They translate t 讓球主客和 as (Handicap HAD/Handicap). Handicap betting is where the weaker team is given an advantage which will be taken into account with the bet. This term is also used in bookmakers in england (I'm not sure about the US), they usually have forms in the bookies to fill out when betting on this:
【讓球主客和】／【讓球】(Handicap HAD/Handicap)[編輯]
設過關，最多過八關。
就球隊嘅強弱而開讓幾多球做盤口，分「讓球主客和」同埋「讓球」（俗稱「亞洲盤」），以馬會公佈嘅讓球盤口做準，盤口嘅叫法係「讓幾多球」同埋「受讓幾多球」。彩金按賠率計。
讓球主客和，係要買中喺讓球整數下賽事嘅勝方或和局而派彩；以下面嘅模擬盤口為例：
強隊（-1） 對 弱隊（+1），即係強隊讓咗一球畀弱隊，假若最後賽果係1:0強隊贏，喺強隊要減一球嚟讓人嘅情況之下，賽果就會設定做0:0，因此一定要押注和局先至有彩金，唔係就輸，如此類推。
讓球（亞洲盤）就冇得買和局，只可以買主隊或者客隊贏，盤口亦唔一定係整數。若果計算過讓球盤口嘅結果出現和局，投注嘅金額係可以退返部份或者全數，行內稱之為「走盤」。以下面嘅模擬盤口為例：
強隊（-0/0.5） 對 弱隊（+0/0.5），即係話強隊要讓零球同埋半球畀弱隊（術語叫「讓平半」，如此類推；「平」即係平手），因為其中有兩個讓球盤口出現，所以個投注金額就會一分為二。假若個原本賽果係0:0和局，強隊要減零即仍然係和局，咁一半投注嘅錢就可以走盤，而另外一半盤要減半球嚟計，因為入球數係冇半球，只係想攞個中位數嚟做指標，咁弱隊加半球已經係超越咗零嘅正數，故此會當成弱隊勝出；用以上呢個例子，如果用兩百蚊買弱隊贏嘅話，咁一百蚊就會退返唔使輸，另外一百蚊就會乘以弱隊嘅賠率嚟收派彩；而如果原本賽果係弱隊贏0:1或更多嘅話，咁直頭可以收晒兩個盤嘅派彩，即係買幾多乘幾多；如此類推。
Other terms include: 1.1.1 【主客和】(Home Away Draw)
【半場主客和】(First-half HAD)
【讓球主客和】／【讓球】(Handicap HAD/Handicap)
1.1.4 【總入球】(Total Goal)
1.1.5 【入球大細】(HiLo)
1.1.6 【入球單雙】(Odd Even)
1.2 過六關投注方式
1.2.1 【波膽】(Correct Score)
1.2.2 【半全場】(HaFu)
1.2.3 【首名入球】(First Goal Scorer)
1.3 固定過關
1.3.1 【套餐主客和】(Section HAD)
1.3.2 【六寶半全場】(6 HaFu)
1.3.3 【孖寶半全膽】(Double HaFu Score)
I would imagine that 孖寶半全膽 translated as hafu is meant to be using the english "half" as a loanword.
These terms are common in newspapers, however they seem to be "jockey club specific" and unless someone is familair with betting in the HKJC then they may not know them!