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 hang, ly nang, ty nong
cho hoc » co hoc, khoa hoc
van cac » van hac, van cau, van bac
van anh » van thanh, tuan anh, van minh
cua cau » cua cac, cua chu, cua cay
du van » duy van, duc van, tu van
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 (ty xang))) or (ky nang)) cho hoc. hieu van cac du van anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((((ty nang) OR (ty xang))) OR (ky nang)) cho hoc. hieu van cac du van anh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((((ty nang) OR (ty xang))) or (ky nang)) cho hoc. hieu van cac du van anh vi cua cau*".