Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
cuc van » chuc van, cuu van, cac van
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
qua hai » qua hoat
dinh xa » dinh ba, dinh va, dinh xu
danh xa » danh ca, canh xa, dan xa
hai cuc » tai cuc, hai cua, thai cua

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