Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
va cai » va cac, va bai, va dai
vu sac » vu sach, vu san, va sac
me hoi » le hoi
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
va ca » va cac, va cao, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky dang ((me hoi) or (ma hoa)). hieu ve nam thuc van thanh ((va ca) OR (va cai)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky dang ((me hoi) OR (ma hoa)). hieu ve nam thuc van thanh ((va ca) OR (va cai)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky dang ((me hoi) or (ma hoa)). hieu ve nam thuc van thanh ((va ca) OR (va cai)) viet".
• Adding a wildcard symbol may retrieve word variants: vu sac ky dang ((me hoi) or (ma hoa)). hieu ve nam thuc van thanh ((va ca) OR (va cai)) viet*.