Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu hien » bieu hien, dieu hien, chieu chien
tu sach » thu sach, su sach, te sach
cach tu » cach thuc
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
cua dan » cua dang, cua ban, ca dan
bach tu » bach thu, bac tu, sach tu
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: tu sach y nang x hoi. ((hieu hien) or (thieu nien)) ((bach tu) OR (cach tu)) cua dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu hien) OR (thieu nien)) ((bach tu) OR (cach tu)) cua dan vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu hien) or (thieu nien)) ((bach tu) OR (cach tu)) cua dan vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu hien) or (thieu nien)) ((bach tu) OR (cach tu)) cua dan vai cua tre*.