Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham xuc » tham nuoc, tham thuc, pham duc
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
va tham » van tham, va cham, va thanh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
van hoe » van hoa, van hoc, van hieu
van hoi » van hoa, van hoc, van loi
cua tre » cua te, cuu tre, cua triet
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 ky nang ((van hoi) or (van hoe)). hieu va tham xuc ((va hanh) OR (van hanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((van hoi) OR (van hoe)). hieu va tham xuc ((va hanh) OR (van hanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((van hoi) or (van hoe)). hieu va tham xuc ((va hanh) OR (van hanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((van hoi) or (van hoe)). hieu va tham xuc ((va hanh) OR (van hanh)) de cua tre*.