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 vat » trinh van, trinh luat, sinh vat
dang cong » dung cong
bang cong » bang song, hang cong, dung cong
van thanh » ban thanh, van tuan
thanh tu » hanh tu, nhanh tu, thanh tung

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 vat ((dang cong) OR (bang cong)) van thanh tu~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh vat ((dang cong) or (bang cong)) van thanh tu*.