Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
hanh nang » anh nang, ganh nang, hanh mang
cao nhung » cho nhung, cam nhung, cao chung
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - hanh nang cao nhung cong ((tac toan) or (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh nang cao nhung cong ((tac toan) OR (tam toan)) cau*.