Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
canh trinh » canh tranh, hanh trinh, canh tinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trinh van » trinh han, trinh quan, trinh toan
van thong » van thuong, van phong, va thong
doc hieu » toc thieu, hoc thieu, hoc hien

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 - canh trinh van thong cong ((tan tran) or (van ban)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh trinh van thong cong ((tan tran) OR (van ban)) ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh trinh van thong cong ((tan tran) or (van ban)) ban*.