Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh dat » thanh san, thanh hai, thanh ha
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
tao hoi » tao khoi, tay hoi, thao hoc
y sang » _ sang, duy sang
ve cac » va cac, vien cac
du va » dau va, tu va, su 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 ((tao hoi) OR (tao boi)). hieu ve cac du va ((thanh dat) OR (thanh van)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y sang ((tao hoi) or (tao boi)). hieu ve cac du va ((thanh dat) OR (thanh van)) su triet~".
• Adding a wildcard symbol may retrieve word variants: toc sach y sang ((tao hoi) or (tao boi)). hieu ve cac du va ((thanh dat) OR (thanh van)) su triet*.