Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
ha thuong » han thuong, hai thuong, va thuong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
than cau » than cap, thanh chau, thanh mau
toan cau » toan cao, toan ban, toan tap
phan cau » phan dau, phan cac, phan tu
cong ha » cong hoa, dong ha, cong san

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - thanh cong ha thuong cong tac ((((than cau) OR (toan cau))) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh cong ha thuong cong tac ((((than cau) OR (toan cau))) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - thanh cong ha thuong cong tac ((((than cau) OR (toan cau))) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh cong ha thuong cong tac ((((than cau) OR (toan cau))) or (phan cau))*.