Perhaps you should try some spelling variations:
van dinh » van minh, van dich, va dinh
sach thu » sach thue, sach tham, cach thuc
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dinh di » dinh du, dinh vi, danh di
tam tu » nam tu, cam tu, tam thuc
di cau » da cau, diem cau
dam tu » nam tu, cam tu, dam thuc

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: toc ((sach thu) OR (sach thieu)) nang xa hoi. hieu va ((dam tu) OR (tam tu)) van dinh di cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach thu) OR (sach thieu)) nang xa hoi. hieu va ((dam tu) or (tam tu)) van dinh di cau tren~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach thu) OR (sach thieu)) nang xa hoi. hieu va ((dam tu) or (tam tu)) van dinh di cau tren*.