Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
vu nang » vuc nang, va nang, vu dang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
v nang » va nang, van nang, voi nang
vi cua » di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (vu nang)) xa hoi. hieu ve cham duc va hanh ((vi cua) OR (vai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) or (vu nang)) xa hoi. hieu ve cham duc va hanh ((vi cua) OR (vai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (vu nang)) xa hoi. hieu ve cham duc va hanh ((vi cua) OR (vai cua)) tre*.