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

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 (hostile environments))) OR (((coastal environment) OR (digital environment)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hostile environment) OR (hostile environments))) or (((coastal environment) or (digital environment))))".
• Adding a wildcard symbol may retrieve word variants: ((((hostile environment) OR (hostile environments))) or (((coastal environment) or (digital environment))))*.