Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
qua cham » qua hai, qua cac, va cham
cham tuc » nham thuc, pham thuc, tham thuc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dap
va dau » va dao
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu qua cham tuc ((va dan) OR (va dau)) dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang x hoi. hieu qua cham tuc ((va dan) OR (va dau)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang x hoi. hieu qua cham tuc ((va dan) OR (va dau)) dai cua tre*.