Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
luan nang » luan van, van nang, luan san
ban thanh » ban hanh, ban hang
thanh cay » thanh tay, nhanh cay, thanh ca
luan han » luan hoan, luan phan, luan van
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 chieu sang - doanh doanh ((luan han) or (luan nang)) cong ban thanh cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - doanh doanh ((luan han) OR (luan nang)) cong ban thanh cay.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - doanh doanh ((luan han) or (luan nang)) cong ban thanh cay*.