Perhaps you should try some spelling variations:
doanh quang » doan quang, doanh quan, doanh luan
quang trong » quang truong, quang trung, quan trong
chieu sang » chieu sach, chieu xanh, hieu lang
hang doanh » hanh doanh, nhung doanh, van doanh
gian chau » gian cham, gian cua, gian cac
cong tac » cong ty
tac gian » tac gia, tac giai, tac giam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dieu hanh) or (chieu sang)) - hang doanh quang trong cong tac gian chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (chieu sang)) - hang doanh quang trong cong tac gian chau.
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (chieu sang)) - hang doanh quang trong cong tac gian chau*.