Perhaps you should try some spelling variations:
doanh doanh » doanh hoan, doanh thanh, dong doanh
nhung cong » dung cong, thong cong, hang cong
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
tai nhung » thai nhung, thi nhung, tai hung
cong luan » tong luan, cong tuan, dong luan
toan » tran

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) or (hoc thieu)) xanh - ((doanh doanh) OR (toan doanh)) tai nhung cong luan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) xanh - ((doanh doanh) OR (toan doanh)) tai nhung cong luan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc thieu)) xanh - ((doanh doanh) OR (toan doanh)) tai nhung cong luan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc thieu)) xanh - ((doanh doanh) OR (toan doanh)) tai nhung cong luan van ban*.