Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
cho chieu » ho chieu, theo chieu, chon chien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
mang va » mang vua, bang va, dang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho chieu tinh - hanh ((mang va) or (hang va)) nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho chieu tinh - hanh ((mang va) OR (hang va)) nhung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: cho chieu tinh - hanh ((mang va) or (hang va)) nhung cong tac toan cau*.