Perhaps you should try some spelling variations:
"defense regulation" » "defense education", "reverse regulation", "defective regulation"
"release regulation" » "response regulation", "release ventilation", "release preparation"
"disease regulation" » "base regulation"

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: (("defense regulation") OR ((("release regulation") OR ("disease regulation")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"defense regulation\") or (((\"release regulation\") OR (\"disease regulation\"))))".
• Removing quotes may allow a broader search: (( defense regulation ) or ((( release regulation ) OR ( disease regulation )))).
• Adding a wildcard symbol may retrieve word variants: (("defense regulation") or ((("release regulation") OR ("disease regulation"))))*.