Perhaps you should try some spelling variations:
mental function » mental functions, potential function, placental function
men's function » green's function, mixer's function, cell's function
fields holger » fields roger, fields hilbert, fields higher
holger team » holder tea, boulder team

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: germany ((men's function) OR (mental function)) fields holger team.
• Adding a wildcard symbol may retrieve word variants: germany ((men's function) or (mental function)) fields holger team*.