Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc thieu » hoc hien
dung cong » dung trong
trung ha » trung hoc, trung tam, trung cap
cong san » cong tac
toan cao » toan tap
toan ban » van ban
ha dung » hai dung, kha dung, nha dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (toc thieu)) xanh - thanh trung ha dung cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) xanh - thanh trung ha dung cong san ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) xanh - thanh trung ha dung cong san ((toan cao) or (toan ban))*.