Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
ban nhung » ban phuong, gian nhung, bang chung
san nhung » sang nhung, sao nhung, gian nhung
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, ban cua, cong cua
dung cua » dung luan, dung cho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((mang cua) OR (dung cua)) nhung cong ((ban nhung) OR (san nhung)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((mang cua) or (dung cua)) nhung cong ((ban nhung) OR (san nhung)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((mang cua) or (dung cua)) nhung cong ((ban nhung) OR (san nhung)) cau*.