Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
hang vi » hang va, hanh vi, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
goc va » hoc va, loc va, doc va
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 y nang x hoi. lieu va cham ((goc va) or (duc va)) ((hanh di) or (hang vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. lieu va cham ((goc va) OR (duc va)) ((hanh di) OR (hang vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. lieu va cham ((goc va) or (duc va)) ((hanh di) or (hang vi)) cua tre*.