Perhaps you should try some spelling variations:
tactical nuclear » statistical nuclear, clinical nuclear, national nuclear
particle nuclear » particles nuclear, particle number, particles nuclei
ban treaty » a treaty
test ban » west bank, test bed

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