Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cua hang » cua dang, cua nhung, cua ban
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan dau » phan tu, hang dau

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 - hanh sinh ((cua hang) or (cua cong)) cong tac phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh sinh ((cua hang) OR (cua cong)) cong tac phan dau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh sinh ((cua hang) or (cua cong)) cong tac phan dau*.