Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
khoa hoc » hoa hoc
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach ty
cho hoc » co hoc
tu nang » tru nang, tu nong, tu nano
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
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 tu nang ((cho hoc) OR (khoa hoc)). hieu ve cac ((xuc van) or (luc van)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang ((cho hoc) OR (khoa hoc)). hieu ve cac ((xuc van) OR (luc van)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang ((cho hoc) OR (khoa hoc)). hieu ve cac ((xuc van) or (luc van)) hanh vi cua cau*".