Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
luan hang » luan nang, luan han, luan hung
cong ban » cong bang, cong san, cong tan
ban hanh » ban hang
hanh cay » nhanh cay, hanh cac, hanh cat

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 ((luan hang) or (luan van)) cong ban hanh cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - doanh doanh ((luan hang) OR (luan van)) cong ban hanh cay*.