Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
thuoc va » thuc va, thuoc ma, thuong va
va hanh » van hanh, va thanh, va danh
van lam » van nam
ky lang » ky nang, ky dang, ky tang
lai hoa » dai hoa, loai hoc
lai hoi » dai hoi, lai roi, mai hoi
san ky » sang ky, van ky, dan ky
phi » phai

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: phi san ky lang ((lai hoi) OR (lai hoa)). hieu van lam thuoc va hanh vi ((dua tren) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "phi san ky lang ((lai hoi) OR (lai hoa)). hieu van lam thuoc va hanh vi ((dua tren) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: phi san ky lang ((lai hoi) OR (lai hoa)). hieu van lam thuoc va hanh vi ((dua tren) or (va triet))*.