Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doi chi, ho chieu, mot chieu
tang luan » dung luan
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, thong cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: ((doi chieu) or (doc hieu)) xanh - hanh ((tang cua) or (tang luan)) nhung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) xanh - hanh ((tang cua) OR (tang luan)) nhung cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) xanh - hanh ((tang cua) or (tang luan)) nhung cong tac toan cao*.