Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dinh vai » dinh van, dinh vi, dinh va
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, tu cach
te sach » toc sach
ro hai » co hai, o hai, do hai
so hai » son hai, su hai, so ha
va am » va lam, va cam

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 sach) OR (te sach)) ky nang ((ro hai) OR (so hai)). hieu va am thuc va dinh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang ((ro hai) or (so hai)). hieu va am thuc va dinh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang ((ro hai) or (so hai)). hieu va am thuc va dinh vai cua viet*.