Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
hanh di » hanh de, hang di, danh di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
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 x hoi. hieu va cam tuc ban ((hanh di) OR (hanh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang x hoi. hieu va cam tuc ban ((hanh di) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. hieu va cam tuc ban ((hanh di) OR (hanh vi)) cua tre*.