Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
tran van » luan van
lang van » dang van, tang van, hoang van
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cac » nhan cach, phan dau, phan lap

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 xanh - hanh ((tran van) or (lang van)) trong cong tac phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - hanh ((tran van) OR (lang van)) trong cong tac phan cac.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - hanh ((tran van) or (lang van)) trong cong tac phan cac*.