Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
thanh de » hanh de, thanh ve, thanh do
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tuc » cua duc, cua thuoc, luat tuc
luc va » duc va, tuc va, loc va
ve cac » va cac, vien cac
cua tu » cua su, cua cu, cua te

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