Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
nhan dang » nhan dan, phan dang, tran dang
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong van » cong vang, cong san, song van
van hang » van khang, van hoang, van thang
hang cao » hoang cao, nang cao, hang ca

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 - nhan dang ((cua dung) or (cua dong)) cong van hang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - nhan dang ((cua dung) OR (cua dong)) cong van hang cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - nhan dang ((cua dung) or (cua dong)) cong van hang cao*.