Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
bang cong » dang cong, bang song, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
tranh va » tranh van, trinh va, thanh va
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (theo chieu)) xanh - hanh ((tranh va) OR (trang va)) bang cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chieu)) xanh - hanh ((tranh va) OR (trang va)) bang cong tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (theo chieu)) xanh - hanh ((tranh va) OR (trang va)) bang cong tan van ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chieu)) xanh - hanh ((tranh va) OR (trang va)) bang cong tan van ban*.