Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chieu sang » chieu sach, chieu xanh, nhieu tang
duong manh » duong van
hieu lang » hieu quang, nhieu tang, hieu van
cong danh » cuong danh, cong dan, cong thanh
trang va » tran van, hang va
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) OR (chieu sang)) - hanh trang va dung ((duong manh) or (cong danh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (chieu sang)) - hanh trang va dung ((duong manh) OR (cong danh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) OR (chieu sang)) - hanh trang va dung ((duong manh) or (cong danh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) OR (chieu sang)) - hanh trang va dung ((duong manh) or (cong danh)) toan cau*.