Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh va, hanh tai, hanh van
tu sach » thu sach, su sach, te sach
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet

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 ky ((dang xa) or (van xay)) hoi. hieu van cam cuc ban ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xa) OR (van xay)) hoi. hieu van cam cuc ban ((hanh vai) OR (hanh vi)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang xa) or (van xay)) hoi. hieu van cam cuc ban ((hanh vai) OR (hanh vi)) cua tre*".