Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
cong tac » cong ty
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
duoc va » nuoc va, duc va, duoc ma
van lam » van nam
tac hoi » tao hoi, tay hoi, tac hai
anh va » hanh va

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 thu cong tac hoi. hieu van lam duoc va ((hanh tai) or (anh va)) ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu cong tac hoi. hieu van lam duoc va ((hanh tai) OR (anh va)) ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: te sach thu cong tac hoi. hieu van lam duoc va ((hanh tai) or (anh va)) ((cua triet) or (su triet))*.