Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doanh cua » doanh luan
van khang » van khanh, van thanh, van quang
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » ban cua
cong van » cong vang, cong san, song van
khang tu » hang tu, khang cu, khong tu

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 ((manh cua) or (doanh cua)) nhung cong van khang tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh ((manh cua) OR (doanh cua)) nhung cong van khang tu.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh ((manh cua) or (doanh cua)) nhung cong van khang tu*.