Perhaps you should try some spelling variations:
su sach » so sach, vu sach
dinh ve » dinh ket, dinh van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
so sanh » do sanh
loc va » hoc va, luc va
ve cua » le cua, de cua, te cua
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky nang x hoi. hieu va cam ((loc va) OR (tuc xa)) dinh ve cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky nang x hoi. hieu va cam ((loc va) or (tuc xa)) dinh ve cua tre*.