Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh de » hanh ve
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
luc va » duc va, tuc va, loc va
va cau » van cau, va cac, 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: ((toc sach) or (hoc sach)) vu nang xa hoi. hieu va cau luc va ((hanh de) or (hanh kem)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) vu nang xa hoi. hieu va cau luc va ((hanh de) OR (hanh kem)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) vu nang xa hoi. hieu va cau luc va ((hanh de) or (hanh kem)) cua tre*.