Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
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, te sach
sach ky » sac ky, sach y, sach ty
son hai » cong hai
so hai » su hai, so ha, co hai
ro hai » co hai, o hai, do hai
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 ky nang ((ro hai) OR (((so hai) OR (son hai)))). hieu va am thuc va dinh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ro hai) or (((so hai) OR (son hai)))). hieu va am thuc va dinh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ro hai) or (((so hai) OR (son hai)))). hieu va am thuc va dinh vai cua triet*.