Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hoc thieu » toc thieu, hoc hien
manh tran » manh toan, manh tuan, canh tranh
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
ho chieu » theo chieu, doi chieu, mot chieu
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - manh tran tuan ((nhung cong) OR (dung cong)) san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - manh tran tuan ((nhung cong) OR (dung cong)) san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - manh tran tuan ((nhung cong) OR (dung cong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - manh tran tuan ((nhung cong) OR (dung cong)) san toan cau*.