Perhaps you should try some spelling variations:
tranh van » tran van, trinh van, thanh van
tien manh » tien thanh, tieng anh, tran manh
hang cong » dang cong, hang nong, bang cong
tien anh » tieng anh, dien anh, tien thanh
van hang » van khang, van hoang, van thang
cong tan » cong tac, cong san, cong thanh
cac cau » cac mau, bac cau, ca cau
van hau » van ha, van hai, van dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien manh) or (tien anh)) - canh tranh van hang cong tan ((cac cau) or (van hau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (tien anh)) - canh tranh van hang cong tan ((cac cau) OR (van hau)).
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) or (tien anh)) - canh tranh van hang cong tan ((cac cau) or (van hau))*.