Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
nang xa » nang x, lang xa, nang ma
van hau » van ha, van hai, van dau
hau duc » huu duc, ha duc, pham duc
hanh ve » hanh vi, hanh va
cua tre » cua te, cuu tre, cua triet

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