Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
ke cong » te cong, ve cong, khoe cong
tac hoi » tao hoi, tay hoi, tac hai
van lam » van nam
ky cong » ly cong, khu cong, cay cong
duoc va » nuoc va, duc va, duoc ma
anh vai » anh bai, anh van, anh tai
anh va » hanh va
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky cong) OR (ke cong)) tac hoi. hieu van lam duoc va ((anh vai) or (anh va)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky cong) OR (ke cong)) tac hoi. hieu van lam duoc va ((anh vai) OR (anh va)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky cong) OR (ke cong)) tac hoi. hieu van lam duoc va ((anh vai) or (anh va)) va triet".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky cong) OR (ke cong)) tac hoi. hieu van lam duoc va ((anh vai) or (anh va)) va triet*.