Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu xanh » chieu sach, chieu sang, chieu tinh
ho chieu » theo chieu, hoc thieu, doi chieu
tran van » luan van
cong san » cong tac
san toan » van toan, dan toan, manh 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 xanh - hanh ((tran van) or (hang va)) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - hanh ((tran van) OR (hang va)) nhung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh ((tran van) or (hang va)) nhung cong san toan cao*.