Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
cam tuc » cam xuc, cam tu, nam thuc
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
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: ((((te sach) or (toc sach))) or (so sach)) ky nang x hoi. hieu va cam tuc va hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (toc sach))) OR (so sach)) ky nang x hoi. hieu va cam tuc va hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((te sach) or (toc sach))) or (so sach)) ky nang x hoi. hieu va cam tuc va hang di cua tre*.