Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
nhan dang » nhan dan, phan dang, tran dang
van khang » van khanh, van thanh, van quang
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
van hang » van hoang, van thang, ban hang

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) OR (van khang)) 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) OR (van khang)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - nhan dang ((cua dung) or (cua dong)) cong ((van hang) OR (van khang)) cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - nhan dang ((cua dung) or (cua dong)) cong ((van hang) OR (van khang)) cao*.