Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
cua tre » cua te, cuu tre, cua triet
vu nang » vuc nang, va nang, vu dang
qua ca » qua cac, qua cua, qua cai
luc va » duc va, tuc va, loc va
v nang » va nang, van nang, voi nang
ca luc » cau luc, ca lua
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: thu sach ((v nang) or (vu nang)) x hoi. hieu qua ca luc va ((hanh di) or (hang di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((v nang) OR (vu nang)) x hoi. hieu qua ca luc va ((hanh di) OR (hang di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) or (vu nang)) x hoi. hieu qua ca luc va ((hanh di) or (hang di)) cua tre*.