Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
xuc van » duc van, luc van, xuc ban
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, va cam
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 (ma hoa)). hieu ve cam xuc van 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 (ma hoa)). hieu ve cam xuc van 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 (ma hoa)). hieu ve cam xuc van hanh va cua tre*".