Perhaps you should try some spelling variations:
danh giaen » dan gian, danh kien, danh dien
dat tren » dat trong, dua tren
danh gia » dan gian
tu sach » thu sach, su sach, te sach
van hoi » van hoa, van hoc, van hoe
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty dang) OR (ty hang)) van hoi. hieu va cam tu va ((danh gia) or (danh giaen)) dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty dang) OR (ty hang)) van hoi. hieu va cam tu va ((danh gia) OR (danh giaen)) dat tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty dang) OR (ty hang)) van hoi. hieu va cam tu va ((danh gia) or (danh giaen)) dat tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty dang) OR (ty hang)) van hoi. hieu va cam tu va ((danh gia) or (danh giaen)) dat tren*.