Perhaps you should try some spelling variations:
ngung cong » nhung cong, dung cong, nganh cong
doi chieu » doc hieu, doi chi, ho chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
chat » nhat, phat

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 (toc thieu)) tach - hanh tinh chat ngung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (toc thieu)) tach - hanh tinh chat ngung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (toc thieu)) tach - hanh tinh chat ngung cong tac toan cau*.