Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ty nang » ty xang, ty hang, ly nang
cho hoc » co hoc, khoa hoc
van cac » van hac, van cau, van bac
do tuan » do xuan, do quang
cua cau » cua cac, cua chu, cua cay
cac do » cac don, cac doi, cac du
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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 ((ty nang) or (ky nang)) cho hoc. hieu van cac do tuan anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ky nang)) cho hoc. hieu van cac do tuan anh vi cua cau*.