Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((y nang) or (v nang)) x hoi. hieu va cac xuc va hang di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (v nang)) x hoi. hieu va cac xuc va hang di cua vat.
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (v nang)) x hoi. hieu va cac xuc va hang di cua vat*.