Perhaps you should try some spelling variations:
thanh do » thanh pho, thanh hoa, thanh loi
thanh de » hanh de, thanh ve, thanh le
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
luc va » duc va, tuc va, loc va
va coc » va cuoc, va cac, va hoc
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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: vu sach ty lang xa hoi. hieu va coc luc va ((thanh de) OR (thanh do)) ((cua tu) OR (cua cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty lang xa hoi. hieu va coc luc va ((thanh de) OR (thanh do)) ((cua tu) or (cua cu))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ty lang xa hoi. hieu va coc luc va ((thanh de) OR (thanh do)) ((cua tu) or (cua cu))*.