Perhaps you should try some spelling variations:
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu xang » ty xang, tu lang, tu quang
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
soc va » hoc va, loc va, doc va
cua su » qua su

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 tu xang xa hoi. ((hieu va) or (thien van)) cham soc va hanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu xang xa hoi. ((hieu va) OR (thien van)) cham soc va hanh dai cua su.
• Adding a wildcard symbol may retrieve word variants: te sach tu xang xa hoi. ((hieu va) or (thien van)) cham soc va hanh dai cua su*.