Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tang luan » dung luan
doc hieu » toc thieu, hoc thieu, hoc hien
than cua » nhan cua, thai cua, gian cua
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man
ban cua » ban quan

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 - hanh ((((than cua) or (ban cua))) or (tang luan)) thuong cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((((than cua) OR (ban cua))) OR (tang luan)) thuong cong dan than ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((((than cua) or (ban cua))) or (tang luan)) thuong cong dan than ban*.