Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam thuoc » nam thuoc, am thuc, cay thuoc
khu cong » thu cong, thi cong, cuu cong
cong tac » cong ty
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, tao duoc
anh tai » hanh tai, anh thai, vanh tai
tac hoi » tao hoi, tay hoi, tac hai
sac khu » cac khu, sac nhu, sach thu
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 khu cong tac hoi. hieu van ((lam duoc) OR (lam thuoc)) va ((anh tai) or (anh va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac khu cong tac hoi. hieu van ((lam duoc) OR (lam thuoc)) va ((anh tai) OR (anh va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac khu cong tac hoi. hieu van ((lam duoc) OR (lam thuoc)) va ((anh tai) or (anh va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sac khu cong tac hoi. hieu van ((lam duoc) OR (lam thuoc)) va ((anh tai) or (anh va)) cua triet*.