Perhaps you should try some spelling variations:
"article and nuclear physical" » "article and nuclear physics", "article and nonlinear physical", "article and nuclear medical"
"articles and nuclear material" » "articles and nuclear materials", "articles and nuclear matrix", "articles and nuclear matter"

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: (("article and nuclear physical") OR ("articles and nuclear material")).
• Removing quotes may allow a broader search: (( article and nuclear physical ) or ( articles and nuclear material )).
• Adding a wildcard symbol may retrieve word variants: (("article and nuclear physical") or ("articles and nuclear material"))*.