Perhaps you should try some spelling variations:
experimental pharmacology » experimentellen pharmakologie
environmental psychology » developmental psychology, environmental policy
experimental psychology » developmental psychology

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: handbook of ((experimental pharmacology) OR (((experimental psychology) OR (environmental psychology)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "handbook of ((experimental pharmacology) or (((experimental psychology) OR (environmental psychology))))".
• Adding a wildcard symbol may retrieve word variants: handbook of ((experimental pharmacology) or (((experimental psychology) OR (environmental psychology))))*.