Perhaps you should try some spelling variations:
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 tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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) or (hieu qua)) - thanh ((tran tuan) or (ban thanh)) dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu qua)) - thanh ((tran tuan) OR (ban thanh)) dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu qua)) - thanh ((tran tuan) or (ban thanh)) dung cong tac toan cau*.