Perhaps you should try some spelling variations:
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((thanh trung) OR (thanh tung)) cua thong cong ((dan than) OR (van than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((thanh trung) or (thanh tung)) cua thong cong ((dan than) OR (van than)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((thanh trung) or (thanh tung)) cua thong cong ((dan than) OR (van than)) cau*.