Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
xuc ban » duc ban, cuc ban, quoc ban
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hang ca » hang va, nang cao, hang tai
hang xa » hoang xa, hang va, lang xa
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 ty ((hang xa) OR (hang ca)) hoi. hieu van cam xuc ban ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((hang xa) OR (hang ca)) hoi. hieu van cam xuc ban ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((hang xa) OR (hang ca)) hoi. hieu van cam xuc ban ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((hang xa) OR (hang ca)) hoi. hieu van cam xuc ban ((hanh vai) or (hanh va)) cua tre*.