Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van nang » van quang, van ban, van dong
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, voi nang
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 (van nang)) x hoi. hieu va cam 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 (van nang)) x hoi. hieu va cam luc va ((hanh di) OR (hang di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((v nang) OR (van nang)) x hoi. hieu va cam luc va ((hanh di) or (hang di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) OR (van nang)) x hoi. hieu va cam luc va ((hanh di) or (hang di)) cua tre*.