Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
chan cau » phan cau, can cau, chinh cau
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh trinh vat nhung ((cong dan) OR (cong tan)) chan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh trinh vat nhung ((cong dan) OR (cong tan)) chan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh trinh vat nhung ((cong dan) OR (cong tan)) chan cau*.