Perhaps you should try some spelling variations:
te sach » toc sach
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
sach ky » sac ky, sach y, sach ty
ve cham » va cham, vu cham, ve chim
xay hoi » tay hoi, cay phoi, gay thoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
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: te sach ky dang ((xay hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((xay hoi) OR (xa hoi)). hieu ((ve cham) OR (ve chat)) xuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((xay hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) xuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((xay hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) xuc va hanh vi cua tre*.