Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
luoc van » luoc can, luoc va, luc van
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
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 ky nang ((ma hoi) or (xa hoi)). hieu ve cam ((xuc van) or (luoc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((ma hoi) OR (xa hoi)). hieu ve cam ((xuc van) OR (luoc van)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((ma hoi) or (xa hoi)). hieu ve cam ((xuc van) or (luoc van)) hanh vi cua tre*.