Perhaps you should try some spelling variations:
luan chung » luan chinh
hoc thieu » toc thieu, hoc hien
tinh sang » tinh quang, tinh trang, trinh san
sang luan » tang luan, hang luan, san luan
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tieu) or (hoc thieu)) xanh - tinh sang luan chung ((cong tan) OR (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (hoc thieu)) xanh - tinh sang luan chung ((cong tan) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (hoc thieu)) xanh - tinh sang luan chung ((cong tan) OR (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (hoc thieu)) xanh - tinh sang luan chung ((cong tan) OR (cong tac)) toan cao*.