Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh le » thinh le, thanh ve, thanh de
thu sach » thuat sach, thuoc sach, thu hoach
thanh te » thanh ve, thanh de, thanh tu
tham soc » cham soc, tham nuoc, thai son
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
tu nong » tu dong, tu cong, tu tong
va tham » van tham, va cham, va thanh
soc va » hoc va, loc va, doc va
nong x » nong xa, nang x, nong e
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) tu nong x hoi. hieu va tham soc va ((thanh te) OR (thanh le)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu nong x hoi. hieu va tham soc va ((thanh te) OR (thanh le)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) tu nong x hoi. hieu va tham soc va ((thanh te) OR (thanh le)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tu nong x hoi. hieu va tham soc va ((thanh te) OR (thanh le)) cua triet*.