Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
thuc va » thuc vat, thuc dan, thuc day
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
vi cua » di 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: thuat sach y nang ma hoa. ((hieu va) OR (hieu qua)) am thuc va dan ((vi cua) OR (vai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ma hoa. ((hieu va) or (hieu qua)) am thuc va dan ((vi cua) OR (vai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ma hoa. ((hieu va) or (hieu qua)) am thuc va dan ((vi cua) OR (vai cua)) triet*.