Perhaps you should try some spelling variations:
hostile environment » hostile environments, mobile environment, hospital environment
digital environment » virtual environment, coastal environments
total environment » global environment, coastal environments, virtual environment

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: ((hostile environment) OR (((total environment) OR (digital environment)))).
• Adding a wildcard symbol may retrieve word variants: ((hostile environment) or (((total environment) or (digital environment))))*.