Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
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, v nang, may nang
tac va » tac xa, tuc va, tac ha

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) or (ly nang)) xa hoi. hieu va cac ((tac va) or (tac da)) van dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. hieu va cac ((tac va) OR (tac da)) van dat cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly nang)) xa hoi. hieu va cac ((tac va) or (tac da)) van dat cua tre*.