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 luc » hau loc, cau luc, nhan luc
luc van » luoc van, luu van, duc van
hanh te » hanh ve, hanh de, hanh he
hanh tu » anh tu, danh tu
cua tre » cua te, cuu tre, cua triet
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 luc van ((hanh te) or (hanh tu)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu van hau luc van ((hanh te) OR (hanh tu)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu van hau luc van ((hanh te) or (hanh tu)) cua tre*.