Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
tran vant » tran viet, tan van, tran vinh
dung cong » dung trong
tran van » luan van
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - canh ((tran vant) or (tran van)) dung cong tac phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - canh ((tran vant) OR (tran van)) dung cong tac phan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - canh ((tran vant) or (tran van)) dung cong tac phan cau*.