Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, ve chim
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
ve cam » ve cac, va cam, ve cai
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho
vi ca » vit ca, li ca, va ca

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 y nang x hoi. hieu ((ve cam) or (((ve cham) or (vu cham)))) xuc va hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu ((ve cam) OR (((ve cham) OR (vu cham)))) xuc va hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((ve cam) or (((ve cham) or (vu cham)))) xuc va hanh vi ca viet*.