Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
ky lang » ky nang, ky dang, ky tang
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
di cua » dai cua, doi cua, de cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, va hoi
ve nam » he nam, va nam, le nam

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: tu sac ky lang ((ha hoi) OR (xa hoi)). hieu ve nam thuc va hanh ((di cua) OR (vai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky lang ((ha hoi) OR (xa hoi)). hieu ve nam thuc va hanh ((di cua) or (vai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang ((ha hoi) OR (xa hoi)). hieu ve nam thuc va hanh ((di cua) or (vai cua)) triet*.