Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach thu » bach nhu, sach thu, bich thuy
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ca dan » ca dao
cua te » cua tu
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 vien bach thu ((ca dan) or (cac dan)) vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu vien bach thu ((ca dan) OR (cac dan)) vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu vien bach thu ((ca dan) or (cac dan)) vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu vien bach thu ((ca dan) or (cac dan)) vi ((cua tre) OR (cua te))*.