Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky dang ((ma hoi) OR (xa hoi)). hieu ve cac xuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang ((ma hoi) OR (xa hoi)). hieu ve cac xuc va hanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky dang ((ma hoi) OR (xa hoi)). hieu ve cac xuc va hanh va cua tre*".