Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
manh tran » manh toan, manh tuan, canh tranh
hang cong » dang cong, hang nong, bang cong
tran van » luan van
van hang » van khang, van hoang, van thang
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
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 lang - manh tran van hang cong dan ((than cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - manh tran van hang cong dan ((than cau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - manh tran van hang cong dan ((than cau) or (phan tu))*.