Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
ma hoi » xa hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
cua tu » cua tuc, cua su, cua cu

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

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