Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
han hung » phan hung, van hung, han ung
cong tan » cong tac, cong san, cong thanh
chan cau » phan cau, chinh cau, nhanh cau
can cau » van cau, ban cau, ca cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh trinh han hung ((cong dong) OR (cong tan)) ((chan cau) OR (can cau))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh han hung ((cong dong) or (cong tan)) ((chan cau) or (can cau))*.