Perhaps you should try some spelling variations:
hanh trang » thanh trung, hanh trinh, minh trang
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: doc hieu xanh - ((hanh trang) OR (canh tranh)) va dung ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((hanh trang) OR (canh tranh)) va dung ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((hanh trang) OR (canh tranh)) va dung ((cong dan) or (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((hanh trang) OR (canh tranh)) va dung ((cong dan) or (cong san)) toan cau*.