Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach tu » sach thu, cach tu, sach ty
dinh ve » dinh ket, dinh van
dinh tu » danh tu, dinh cu, tinh tu
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
tu lang » cu lang, tu lanh, xu lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu lang xa hoi. hieu ve ((cau luc) or (cam xuc)) van ((dinh tu) or (dinh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu lang xa hoi. hieu ve ((cau luc) OR (cam xuc)) van ((dinh tu) OR (dinh ve)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu lang xa hoi. hieu ve ((cau luc) or (cam xuc)) van ((dinh tu) or (dinh ve)) cua tre*.