Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang noi » nang doc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
noi hoc » hoi hoc, voi hoc, noi khoa
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
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 noi hoc. hieu ve cac ((xuc van) or (duc tan)) anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang noi hoc. hieu ve cac ((xuc van) OR (duc tan)) anh vi cua cau*.