Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung chan » trung phan, trong chan, trung can
hieu xanh » chieu xanh, hieu manh, hieu nganh
chan dung » van dung, dan dung
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van 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 chan dung ((cong tan) OR (cong san)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung chan dung ((cong tan) OR (cong san)) ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh trung chan dung ((cong tan) OR (cong san)) ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung chan dung ((cong tan) OR (cong san)) ((toan cau) or (toan ban))*.