Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, ve triet
su tien » su kien, su hien, tu tieng
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
y sang » _ sang, duy sang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
du va » dau va, su va, vu va

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: toc sach y sang ma hoi. hieu ve cac ((du va) OR (tu va)) thanh dat ((su triet) OR (su tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y sang ma hoi. hieu ve cac ((du va) or (tu va)) thanh dat ((su triet) OR (su tien))~".
• Adding a wildcard symbol may retrieve word variants: toc sach y sang ma hoi. hieu ve cac ((du va) or (tu va)) thanh dat ((su triet) OR (su tien))*.