Perhaps you should try some spelling variations:
canh trang » canh tranh, hanh trang, banh trang
hieu manh » chieu xanh, hieu nganh, hien hanh
trang va » tran van, hang va
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chan cau » phan cau, can cau, chinh cau
va lang » va nang, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (dieu hanh)) - canh trang va lang ((cong dan) OR (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - canh trang va lang ((cong dan) OR (cong san)) chan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (dieu hanh)) - canh trang va lang ((cong dan) OR (cong san)) chan cau*".