Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
van doan » van doanh, van toan, van hoan
hieu va » lieu va, hieu qua
doan ca » doan cap, dan ca, doan va
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ca cua » co 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: thu sach y nang x hoi. ((hieu van) or (hieu va)) ((tac tu) or (cac du)) van doan ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. ((hieu van) OR (hieu va)) ((tac tu) OR (cac du)) van doan ca cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. ((hieu van) or (hieu va)) ((tac tu) or (cac du)) van doan ca cua tre*.