Perhaps you should try some spelling variations:
biologe » biologie, biology, biologia
biologen » biologien, biologyn, biologian, biology, biologie
biologyn » biologyin, biologyon, biology
biologic » biologie, biology
biological » biologieal, biologyal

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: ((biologe OR (biologen OR biologyn)) OR (biologic OR biological)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((biologe or (biologen or biologyn)) or (biologic OR biological))".
• Adding a wildcard symbol may retrieve word variants: ((biologe or (biologen or biologyn)) or (biologic OR biological))*.