Perhaps you should try some spelling variations:
thanh ca » thanh cha, thanh cac, thanh ha
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, dua ban, duc man
ca cua » co cua
cua te » cua tu

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 ty xang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc ban) OR (duc van)) thanh ca cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc ban) or (duc van)) thanh ca cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc ban) or (duc van)) thanh ca cua te*.