Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
dan dung » van dung, tin dung
tan toan » tan tran, tap toan, dan toan
van toan » van tuan, van tan, van thanh
ap dung » xay dung, van dung

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 ((ap dung) or (dan dung)) cong ((tan toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung ((ap dung) OR (dan dung)) cong ((tan toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung ((ap dung) or (dan dung)) cong ((tan toan) or (van toan)) cao*.