Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
doanh quang » doan quang, doanh quan, doanh luan
quang trong » quang truong, quang trung, quan trong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong tac » cong ty
tac gian » tac gia, tac giai, tac giam
gian cac » gian dan, gian cua

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

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