Perhaps you should try some spelling variations:
xanh dai » vanh dai, xanh di, xanh tai
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
va sac » va cac, va suc, va san
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: va sac ky tang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) or (duc va)) xanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: va sac ky tang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) OR (duc va)) xanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va sac ky tang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) or (duc va)) xanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: va sac ky tang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) or (duc va)) xanh dai cua tre*.