Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
tham xuc » tham nuoc, tham thuc, pham duc
van hoi » van hoa, van hoc, van loi
van hoe » van hoa, van hoc, van hieu
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (thuoc sach)) ky nang ((van hoi) or (van hoe)). hieu va tham xuc va hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky nang ((van hoi) OR (van hoe)). hieu va tham xuc va hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky nang ((van hoi) or (van hoe)). hieu va tham xuc va hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky nang ((van hoi) or (van hoe)). hieu va tham xuc va hanh de cua tre*.