Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh vat » trinh vat, tranh va, tranh van
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
van phan » van phong, van thanh, luan phan

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: ho ((hieu manh) OR (chieu sach)) - canh tranh vat ((hang cong) OR (bang cong)) van phan tu~.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sach)) - canh tranh vat ((hang cong) or (bang cong)) van phan tu*.