Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
luan thong » luan phong, luan tuong, luat thong
thanh chau » thanh cha, thanh cham, thanh chu
hieu quan » hieu qua, lieu quan, thien quan
hanh tang » hanh trang, hanh mang, hanh tung
thanh cau » thanh mau, nhanh cau, thanh ca
anh tang » anh bang, anh dang, anh nang
cong san » cong tac
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quan - ((hanh tang) or (anh tang)) luan thong cong san ((thanh cau) OR (thanh chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - ((hanh tang) OR (anh tang)) luan thong cong san ((thanh cau) OR (thanh chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - ((hanh tang) or (anh tang)) luan thong cong san ((thanh cau) OR (thanh chau))".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - ((hanh tang) or (anh tang)) luan thong cong san ((thanh cau) OR (thanh chau))*.