Perhaps you should try some spelling variations:
tieu trinh » tien trinh, tien thinh, trieu tinh
nhung cong » dung cong, thong cong, hang cong
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
doan phan » doanh phan, toan phan, dan phan
dam phan » d phan, va phan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu trinh - canh tranh van nhung cong ((dam phan) or (doan phan)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu trinh - canh tranh van nhung cong ((dam phan) OR (doan phan)) cac.
• Adding a wildcard symbol may retrieve word variants: theo tieu trinh - canh tranh van nhung cong ((dam phan) or (doan phan)) cac*.