Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
va trien » va truyen, va thiet, va tuyen
thanh vi » hanh vi, thanh va, thanh ve
tuc van » thuc van, truc van, tuc va
hai tuc » thai tuc, hai cuc, thai thuc
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
qua hai » qua hoat

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: co sach ky ((dang xa) OR (dang ha)) hoi. hieu qua hai tuc van thanh vi ((cua triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((dang xa) OR (dang ha)) hoi. hieu qua hai tuc van thanh vi ((cua triet) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((dang xa) OR (dang ha)) hoi. hieu qua hai tuc van thanh vi ((cua triet) or (va trien))*.