Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
van dat » van dao, van dau, dan dat
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tac va » tac da, tuc va, tac ha
tac xa » tuc xa, tac da
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 va cac ((tac va) OR (tac xa)) van dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu va cac ((tac va) OR (tac xa)) van dat cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va cac ((tac va) OR (tac xa)) van dat cua tre*.