Perhaps you should try some spelling variations:
bo sach » hoc sach
co sach » cuon sach, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
xa hanh » xa thanh, xa khanh, va hanh
luu tre » luu tru, cuu tre, luy tre
qua ca » qua cua, qua cai, quan cau
vi luu » vi lua

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: ((bo sach) OR (co sach)) ky lang xa hoi. hieu ((qua ca) OR (qua cac)) tuc xa hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) OR (co sach)) ky lang xa hoi. hieu ((qua ca) or (qua cac)) tuc xa hanh vi luu tre~".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) OR (co sach)) ky lang xa hoi. hieu ((qua ca) or (qua cac)) tuc xa hanh vi luu tre*.