Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
chieu sang » chieu sach, chieu xanh, hieu lang
duong manh » duong van
tranh cua » doanh cua, manh cua
cua nhung » va nhung
ho chieu » theo chieu, hoc thieu, doi chieu
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - canh tranh cua nhung duong manh ((toan cau) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - canh tranh cua nhung duong manh ((toan cau) or (toan ban))*.