Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
cac tinh » dac tinh, cuu tinh, ban tinh
trang va » tran van, hang va
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
chan cau » phan cau, can cau, chinh cau
ha tinh » va tinh, may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((cac tinh) or (ha tinh)) - hanh trang va nhung ((cong tan) OR (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((cac tinh) OR (ha tinh)) - hanh trang va nhung ((cong tan) OR (cong san)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((cac tinh) or (ha tinh)) - hanh trang va nhung ((cong tan) OR (cong san)) chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((cac tinh) or (ha tinh)) - hanh trang va nhung ((cong tan) OR (cong san)) chan cau*.