Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
hanh de » hanh ve
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa

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 vu nang xa hoi. hieu va cao tuc va ((hanh de) or (hanh kem)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach vu nang xa hoi. hieu va cao tuc va ((hanh de) OR (hanh kem)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach vu nang xa hoi. hieu va cao tuc va ((hanh de) or (hanh kem)) cua tre*.