Perhaps you should try some spelling variations:
ve triet » va trien, su triet
den vai » den va, den vay, den vi
cao duc » dao duc, cao suc, giao duc
sach tu » sach thu, cach tu, sach ty
tu sach » thu sach, su sach, te sach
song xa » song cua
nong xa » dong xa, nong va, cong xay
qua cao » qua cac, qua ca, qua cai
dan va » doan va, dan ca, ban 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: tu sach tu ((nong xa) OR (song xa)) hoi. hieu qua cao duc va ((den vai) OR (dan va)) ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((nong xa) OR (song xa)) hoi. hieu qua cao duc va ((den vai) or (dan va)) ve triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nong xa) OR (song xa)) hoi. hieu qua cao duc va ((den vai) or (dan va)) ve triet*.