Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
ho chieu » theo chieu, hoc thieu, doi chieu
trang va » hang va
tran van » luan van
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
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: ((ho chieu) or (theo tieu)) xanh - hanh ((trang va) OR (tran van)) nhung cong ban toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo tieu)) xanh - hanh ((trang va) OR (tran van)) nhung cong ban toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo tieu)) xanh - hanh ((trang va) OR (tran van)) nhung cong ban toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo tieu)) xanh - hanh ((trang va) OR (tran van)) nhung cong ban toan cao*.