Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
ky dang » ky danh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc 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: so sach ((ky dang) or (ky nang)) ((ma hoa) or (xa hoi)). hieu ve cham soc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky dang) OR (ky nang)) ((ma hoa) OR (xa hoi)). hieu ve cham soc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dang) or (ky nang)) ((ma hoa) or (xa hoi)). hieu ve cham soc va hanh va cua tre*.