Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
y lang » o lang, _ lang, tay lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) y lang ha hoi. hieu ve ((cam tu) OR (dam tu)) van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y lang ha hoi. hieu ve ((cam tu) OR (dam tu)) van hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y lang ha hoi. hieu ve ((cam tu) OR (dam tu)) van hanh vai cua tre*".