Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tran tuan » tran xuan, tran quang, tran thanh
ho chieu » theo chieu, doi chieu, mot chieu
cong san » cong tac
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) or (quan thanh)) nhung 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) OR (quan thanh)) nhung cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - manh ((tran tuan) or (quan thanh)) nhung cong san toan cau*.