Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chau tinh » ha tinh, cua tinh, cac tinh
trang va » tran van, hang va
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: hoc ((chau tinh) or (cuu tinh)) - hanh trang va dung ((cong dan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (cuu tinh)) - hanh trang va dung ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chau tinh) or (cuu tinh)) - hanh trang va dung ((cong dan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) or (cuu tinh)) - hanh trang va dung ((cong dan) OR (cong san)) toan cau*.