Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thanh de » hanh de, thanh ve, thanh do
su sach » vu sach
so sach » so sanh, bo sach, co sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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: ((su sach) OR (so sach)) ky lang xa hoi. hieu ve cac luc va ((thanh doi) OR (thanh de)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky lang xa hoi. hieu ve cac luc va ((thanh doi) or (thanh de)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky lang xa hoi. hieu ve cac luc va ((thanh doi) or (thanh de)) cua tu*.