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, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
duong manh » duong van
doi chieu » doc hieu, doi chi, ho chieu
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) OR (hanh trang)) 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) OR (hanh trang)) va nhung duong manh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh tranh) OR (hanh trang)) va nhung duong manh ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh tranh) OR (hanh trang)) va nhung duong manh ((toan cau) or (toan cao))*.