Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
bang cong » dang cong, bang song, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
va bang » va nang, va lang, va ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - ((thanh trung) or (thanh tung)) va bang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((thanh trung) OR (thanh tung)) va bang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((thanh trung) or (thanh tung)) va bang cong dan toan cao*.