Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, sinh trung
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
manh hung » anh huong
dap nhung » vap nhung, va nhung, dap ung
ho chieu » theo chieu, doi chieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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: ((ho chieu) OR (hoc thieu)) xanh - ((manh trung) OR (manh hung)) dap nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - ((manh trung) or (manh hung)) dap nhung cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - ((manh trung) or (manh hung)) dap nhung cong tac toan cau*.