Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
dang quang » dung quang, dang hung
doi chieu » doc hieu, doi chi, mot chieu
canh tran » canh tranh, hanh trang, banh trang
nang quan » ban quan, nang suat
tran van » luan van
van dung » van dong, xay dung, tin dung

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: doi chieu xanh - canh tran van dung ((dang quang) OR (nang quan)) van ban~.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - canh tran van dung ((dang quang) or (nang quan)) van ban*.