Perhaps you should try some spelling variations:
cam tuc » cam xuc, cam tu, nam thuc
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
do sai » do dai, do hai, do mai
vi hoc » li hoc
va dan » ca dan, va dao, va dau
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam
sai ky » sac ky
ma hoi » mai hoi, ma hoa, me hoi
va hoc » van hoc
hien » bien, vien, tien

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: do sai ky tang ((ma hoi) OR (xa hoi)). hieu ve cam tuc va dan ((vi hoc) or (va hoc)) hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: do sai ky tang ((ma hoi) OR (xa hoi)). hieu ve cam tuc va dan ((vi hoc) OR (va hoc)) hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "do sai ky tang ((ma hoi) OR (xa hoi)). hieu ve cam tuc va dan ((vi hoc) or (va hoc)) hien".
• Adding a wildcard symbol may retrieve word variants: do sai ky tang ((ma hoi) OR (xa hoi)). hieu ve cam tuc va dan ((vi hoc) or (va hoc)) hien*.