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
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ky dang » ky danh
ve cam » ve cac, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
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: toc sach ((ky dang) or (ky nang)) ma hoi. hieu ((ve cam) or (ve cham)) xuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky dang) OR (ky nang)) ma hoi. hieu ((ve cam) OR (ve cham)) xuc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) or (ky nang)) ma hoi. hieu ((ve cam) or (ve cham)) xuc va hanh va cua tre*.