Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
truong cao » truong dai
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cap » trung tam
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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 ((trung cap) or (truong cao)) thuong cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((trung cap) OR (truong cao)) thuong cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trung cap) or (truong cao)) thuong cong tan van ban*.