Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
tang van » dang van, hoang van, trong van
danh dau » lanh dao, hang dau, danh tu
tang ma » mang may
hieu va » lieu va, hieu qua
danh di » danh du, xanh di, danh dien
luc va » duc va, tuc va, loc va
va coc » va cuoc, va cac, va hoc

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: thuoc sach y ((tang ma) OR (tang van)) hoi. hieu va coc luc va ((danh di) OR (danh dau)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((tang ma) OR (tang van)) hoi. hieu va coc luc va ((danh di) or (danh dau)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((tang ma) OR (tang van)) hoi. hieu va coc luc va ((danh di) or (danh dau)) cua triet*.