Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
va thanh » ban thanh, va tinh, le thanh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac tao » cau tao, cac tro, cac tac
vai cua » dai cua, hai cua, lai cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((lang xa) or (nang x)) hoi. hieu va cac tao ((va thanh) OR (gia thanh)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((lang xa) OR (nang x)) hoi. hieu va cac tao ((va thanh) OR (gia thanh)) vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((lang xa) or (nang x)) hoi. hieu va cac tao ((va thanh) OR (gia thanh)) vai cua triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((lang xa) or (nang x)) hoi. hieu va cac tao ((va thanh) OR (gia thanh)) vai cua triet*.