Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
cua nong » cua cong, cuu nong, cua dong
van dang » van dong, van nang, van dan
van dung » van dong, xay dung, tin 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 ((cua thong) or (cua nong)) song ((van dang) OR (van dung)) thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung ((cua thong) OR (cua nong)) song ((van dang) OR (van dung)) thi.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh trung ((cua thong) or (cua nong)) song ((van dang) OR (van dung)) thi".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung ((cua thong) or (cua nong)) song ((van dang) OR (van dung)) thi*.