Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cong tac » cong ty
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
ky cong » ke cong, ly cong, khu cong
tac hoi » tao hoi, tay hoi, tac hai
van lam » van nam
lam xuc » cam xuc, lam duoc
anh bai » sach bai, danh bat, hinh bai
xuc va » duc va, tuc va, luc va
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) or (toc sach)) ky cong tac hoi. hieu van lam xuc va ((anh bai) or (anh va)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky cong tac hoi. hieu van lam xuc va ((anh bai) OR (anh va)) va triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky cong tac hoi. hieu van lam xuc va ((anh bai) or (anh va)) va triet*.