Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tran tuan » tran xuan, tran thanh, tranh luan
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 ((tran tuan) or (tran quang)) dang cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((tran tuan) OR (tran quang)) dang cong van toan cao*.