Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
cua tre » cua te, cua triet, dua tren
dinh ca » dinh cac, dinh cua, dinh cao
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
me hoi » le hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((me hoi) or (ma hoa)). hieu va cac thuc va dinh ca ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((me hoi) OR (ma hoa)). hieu va cac thuc va dinh ca ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((me hoi) or (ma hoa)). hieu va cac thuc va dinh ca ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((me hoi) or (ma hoa)). hieu va cac thuc va dinh ca ((cua tre) OR (cuu tre))*.