Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach thu, xach tay
van hoe » van hoc, van hieu, van hien
sach tu » sach thu, cach tu, sach uu

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 ty) or (sach tu)) lang ((van hoe) OR (van hoa)). hieu van nam thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) lang ((van hoe) OR (van hoa)). hieu van nam thuc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) lang ((van hoe) OR (van hoa)). hieu van nam thuc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) lang ((van hoe) OR (van hoa)). hieu van nam thuc va hanh vai cua tre*.