Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
danh ca » dan ca, doanh cua, danh gia
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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