Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
va dinh » van dinh, va kinh, va tinh
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
va cham » va tham
cao hoc » co hoc, cho hoc, chat hoc
ty nang » ky nang, ty xang, ty hang
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang cao hoc. hieu ((va cham) OR (va chat)) xuc ((va dinh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang cao hoc. hieu ((va cham) OR (va chat)) xuc ((va dinh) OR (va dan)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang cao hoc. hieu ((va cham) OR (va chat)) xuc ((va dinh) or (va dan)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang cao hoc. hieu ((va cham) OR (va chat)) xuc ((va dinh) or (va dan)) dai cua tre*.