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

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