Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tran tuan » tran xuan, tran quang, tran thanh
ban thanh » ban hanh, ban hang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

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