Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
hanh cat » hanh cac, hanh luat, nhanh cay
hieu va » lieu va, hieu qua
hanh ca » hanh cac, hanh cua, hanh cad
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: thu sach y nang ((le hoi) or (ma hoa)). hieu va cac thuc vat ((hanh ca) OR (hanh cat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((le hoi) OR (ma hoa)). hieu va cac thuc vat ((hanh ca) OR (hanh cat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((le hoi) or (ma hoa)). hieu va cac thuc vat ((hanh ca) OR (hanh cat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((le hoi) or (ma hoa)). hieu va cac thuc vat ((hanh ca) OR (hanh cat)) cua tre*.