Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
cong cong » cong dong, trong cong, dung cong
van thanh » ban thanh, van tuan
doc hieu » toc thieu, hoc thieu, hoc hien
vang cua » mang cua, hang cua, tang cua
van than » van thang, van tuan, van phan
van cua » ban cua, dan cua, nan cua

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 - canh ((van cua) OR (vang cua)) cong cong ((van than) OR (van thanh)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh ((van cua) OR (vang cua)) cong cong ((van than) or (van thanh)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh ((van cua) OR (vang cua)) cong cong ((van than) or (van thanh)) cau*.