Perhaps you should try some spelling variations:
thuc va » thuc vat, thuc dan, thuc day
ky dang » ky nang, ky danh
doi cua » dai cua, hoi cua
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, va danh
na thuc » nam thuc, na thuoc, va thuc
di cua » dai cua, de cua, do cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
le na » le nam, le va, le ta

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: su sac ky dang ((ma hoi) OR (ma hoa)). hieu le na thuc va hanh ((di cua) OR (doi cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky dang ((ma hoi) OR (ma hoa)). hieu le na thuc va hanh ((di cua) or (doi cua)) viet~".
• Adding a wildcard symbol may retrieve word variants: su sac ky dang ((ma hoi) OR (ma hoa)). hieu le na thuc va hanh ((di cua) or (doi cua)) viet*.