Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
duong manh » duong van
doi chieu » doc hieu, doi chi, ho chieu
tranh va » tranh van, trang va, trinh va
toan cau » toan ban, toan tap, toan tai
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: doi chieu sang - hanh tranh va nhung duong manh ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh tranh va nhung duong manh ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh tranh va nhung duong manh ((toan cau) or (toan cao))*.