Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vu dang » su dang, vu quang, cua dang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de 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 dang)) xa hoi. hieu va cam tuc va tinh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (vu dang)) xa hoi. hieu va cam tuc va tinh di cua tre*.