Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
thanh tran » thanh trang, thanh toan, thanh tra
tran tuan » tran xuan, tran quang, tran thanh
tuan dung » tuan duong, tran dung, tan dung
cong tap » cuong tap, cong tan, tong tap
cong tac » cong ty
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 quang) or (hieu qua)) - thanh tran tuan dung ((cong tap) OR (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (hieu qua)) - thanh tran tuan dung ((cong tap) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu quang) or (hieu qua)) - thanh tran tuan dung ((cong tap) OR (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu quang) or (hieu qua)) - thanh tran tuan dung ((cong tap) OR (cong tac)) toan cau*.