Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
qua tham » qua cham, qua than, qua thanh
tham luc » than luc, tham nuoc, tham thuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va dan » ca dan, va dao, va dau
du cua » duy cua, dau cua, dum 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 v nang xa hoi. hieu qua tham luc ((va dan) or (ca dao)) du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang xa hoi. hieu qua tham luc ((va dan) OR (ca dao)) du cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. hieu qua tham luc ((va dan) or (ca dao)) du cua tre*.