Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
van thanh » ban thanh
doc hieu » toc thieu, hoc thieu, hoc hien
canh van » anh van, can van, cach van
ban cong » bang cong, van cong, phan cong
van than » van thang, van phan, ban than
van tuan » van quan, van ban, anh tuan
van cua » vang cua, ban cua, dan 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 ban cong ((van than) OR (((van thanh) OR (van tuan)))) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh van cua ban cong ((van than) or (((van thanh) OR (van tuan)))) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh van cua ban cong ((van than) or (((van thanh) OR (van tuan)))) cau*.