Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
tuc va » thuc va, truc va, tuc xa
v nang » va nang, van nang, voi nang
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao

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 va cam tuc va thanh ((di cua) OR (de 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 va cam tuc va thanh ((di cua) OR (de cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (vu nang)) xa hoi. hieu va cam tuc va thanh ((di cua) OR (de cua)) tre*.