Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hai » thanh phan, thanh hoa, thanh san
tan thanh » tran thanh, tang thanh, toan thanh
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu van
nong x » nong xa, nong e, nong o

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: tu sach tu ((nong x) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) cham duc tan thanh hai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((nong x) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cham duc tan thanh hai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nong x) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cham duc tan thanh hai cua triet*.