Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
va pham » van pham, va phat, va phap
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 (hoc sach)) y nang ((van hoi) or (van hoc)). lieu va pham duc va hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang ((van hoi) OR (van hoc)). lieu va pham duc va hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) y nang ((van hoi) or (van hoc)). lieu va pham duc va hanh de cua tre*.