Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
van dinh » van minh, van dich, va dinh
dinh te » kinh te, dich te, dinh ve
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ang xa » lang xa, mang xa, dang xay
te cua » tue cua, le cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach thu) OR (sach tham)) ang xa hoi. hieu ve ((cau luc) or (cam xuc)) van dinh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach thu) OR (sach tham)) ang xa hoi. hieu ve ((cau luc) OR (cam xuc)) van dinh te cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach thu) OR (sach tham)) ang xa hoi. hieu ve ((cau luc) or (cam xuc)) van dinh te cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach thu) OR (sach tham)) ang xa hoi. hieu ve ((cau luc) or (cam xuc)) van dinh te cua tre*.