Perhaps you should try some spelling variations:
biologe » biologie, biology, biologia
biologen » biologien, biologyn, biologian, biology, biologie
biologian » biologia, biologin, biologien
biologiae » biologicae, biologie, biologia
biologic » biologie, biological, biology

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