Perhaps you should try some spelling variations:
thanh ca » thanh cha, thanh cac, thanh ha
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ve cac » va cac, vien cac
luc va » duc va, tuc va
loc va » hoc va
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 ky) OR (sach y)) tang xa hoi. hieu ve cac ((luc va) OR (loc va)) thanh ca cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) tang xa hoi. hieu ve cac ((luc va) or (loc va)) thanh ca cua te~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) tang xa hoi. hieu ve cac ((luc va) or (loc va)) thanh ca cua te*.