Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van hau » van ha, van hai, van dau
hau duc » huu duc, ha duc, pham duc
duc van » duc va, duc tan, duc manh
hanh ve » hanh vi, hanh va
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang

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