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
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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)) cua thong cong dan 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 cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((thanh trung) OR (thanh tung)) cua thong cong dan than cau*.