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