Perhaps you should try some spelling variations:
ngung cong » nhung cong, dung cong, nganh cong
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
canh tinh » manh tinh, canh tranh, nhanh tinh
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) xanh - ((canh tinh) OR (hanh tinh)) chat ngung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) xanh - ((canh tinh) OR (hanh tinh)) chat ngung cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) xanh - ((canh tinh) OR (hanh tinh)) chat ngung cong tac toan cau*.