Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van dinh » van minh, van dich, va dinh
dinh ve » dinh ket, dinh van
cau luc » cau truc, cau phuc
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
xang xa » lang xa, mang xa, dang xay
hieu ve » hieu va, hieu van
ang xa » lang xa, mang xa, dang xay
ve cua » le cua, de cua, te cua

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

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