Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
thuoc va » thuc va, thuoc ma, thuong va
na thuoc » nha thuoc, nam thuoc, va thuoc
va hanh » van hanh, va thanh, va danh
hieu le » hieu ve, hieu he, hieu ly
lang ha » long ha
sac ky » sai ky
ha hoi » hoa hoi, ha noi, xa hoi
le na » le nam, le va, le ta

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 ((sac ky) OR (cac ky)) lang ha hoi. hieu le na thuoc va hanh vi ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) lang ha hoi. hieu le na thuoc va hanh vi ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) lang ha hoi. hieu le na thuoc va hanh vi ((cua triet) OR (cua viet))*.