Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
dich ve » dich vu, dich te, dinh ve
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
xang xa » lang xa, mang xa, ang xa
ve cua » le cua, de cua, te cua
cua te » cua tu

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

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