Perhaps you should try some spelling variations:
toc sach » thuoc sach, nuoc sach, toc san
hoc sach » hoc sinh, hoc cac, hoc anh
doc sach » nuoc sach, dac sac, bo sach
van nang » van quang, van ban, van dong
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
bao luc » bao thuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
qua bao » qua ban, qua bau, qua lao
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((toc sach) OR (hoc sach))) OR (doc sach)) van nang xa hoi. hieu qua bao luc va hang di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((toc sach) OR (hoc sach))) or (doc sach)) van nang xa hoi. hieu qua bao luc va hang di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((((toc sach) OR (hoc sach))) or (doc sach)) van nang xa hoi. hieu qua bao luc va hang di cua tre*.