Perhaps you should try some spelling variations:
"charities, military sciences" » "charities, military science", "charities, military sites", "charities, military defence"
"charities, military service" » "charities, military science"

Try widening your search to All Fields.

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: (("charities, military service") OR ((("charities, military sciences") OR ("charities, auxiliary sciences")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"charities, military service\") or (((\"charities, military sciences\") OR (\"charities, auxiliary sciences\"))))".
• Removing quotes may allow a broader search: (( charities, military service ) or ((( charities, military sciences ) OR ( charities, auxiliary sciences )))).
• Adding a wildcard symbol may retrieve word variants: (("charities, military service") or ((("charities, military sciences") OR ("charities, auxiliary sciences"))))*.