Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
van nang » van quang, van ban, van dong
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
danh di » danh du, xanh di, danh gia
hoc anh » hoc nganh, hoc nhanh, ngoc anh
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao

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) OR (hoc anh)) van nang xa hoi. hieu va cao tuc va ((danh di) OR (danh dien)) cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc anh)) van nang xa hoi. hieu va cao tuc va ((danh di) OR (danh dien)) cau tren~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc anh)) van nang xa hoi. hieu va cao tuc va ((danh di) OR (danh dien)) cau tren*.