Perhaps you should try some spelling variations:
doanh quang » doan quang, doanh luan, nhanh quang
thieu sang » chieu sang, thieu khang, thieu quang
doanh quan » doanh luan, doan quan, doanh nhan
hoc thieu » toc thieu, hoc hien
cong luan » tong luan, cong tuan, dong luan
van cac » van hac, van cau, van bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - doanh ((doanh quan) OR (doanh quang)) trong cong luan van cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - doanh ((doanh quan) OR (doanh quang)) trong cong luan van cac".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - doanh ((doanh quan) OR (doanh quang)) trong cong luan van cac*.