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 han, luan hung, luan tang
luan nang » luan van, van nang, luan san
ban thanh » ban hanh, ban hang
thanh tay » thanh tai, thanh toan, thanh thuy
cong ban » cong bang, cong san, cong tan

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