Perhaps you should try some spelling variations:
phuong tong » phuong trong, phuong dong, phuong hoang
dan phuong » doan phuong, van phuong, lan phuong
tranh dan » trinh dan, tranh ban, thanh dan
tap quang » tap quan, tac quang, tai quang
toc hieu » doc hieu, hoc thieu, thuc hieu
tong tap » tuong tac, trong tan, cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc hieu) or (toc thieu)) manh - canh tranh dan phuong tong tap quang nam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc hieu) OR (toc thieu)) manh - canh tranh dan phuong tong tap quang nam*.