Perhaps you should try some spelling variations:
practical nuclear » practical nucleic, practice nuclear, fractional nuclear
tactical nuclear » statistical nuclear, clinical nuclear, national nuclear
act treaty » last treaty, each treaty, any treaty

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: (( practical nuclear test a treaty ) OR ((( tactical nuclear test _ treaty ) OR ( tactical nuclear test act treaty )))).
• Adding a wildcard symbol may retrieve word variants: (( practical nuclear test a treaty ) or ((( tactical nuclear test _ treaty ) or ( tactical nuclear test act treaty ))))*.