Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
tuong manh » duong manh, luong manh, tung manh
doc hieu » toc thieu, hoc thieu, hoc hien
hieu luc » hieu luat, hieu qua
tranh va » tranh van, trang va, trinh va
toan cau » toan cao, toan tai
toan ban » van ban
canh » anh, can, hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu luc - canh tranh va nhung tuong manh ((toan cau) or (((toan tap) or (toan ban))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu luc - canh tranh va nhung tuong manh ((toan cau) OR (((toan tap) OR (toan ban)))).
• Adding a wildcard symbol may retrieve word variants: doc hieu luc - canh tranh va nhung tuong manh ((toan cau) or (((toan tap) or (toan ban))))*.