Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
vu nang » vuc nang, va nang, vu dang
hai cua » thai cua, dai cua, hoi cua
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
sach vu » sach va, sach tu, sach uu
loc va » hoc va
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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 ((luc va) OR (loc va)) hanh hai cua te~.
• 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 ((luc va) OR (loc va)) hanh hai cua te.
• 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 ((luc va) OR (loc va)) hanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang ((ma hoi) or (mai hoi)). hieu ve cam ((luc va) OR (loc va)) hanh hai cua te*.