Perhaps you should try some spelling variations:
"articles and nuclear physical" » "articles and nonlinear physical", "articles and nuclear medical"
"articles and nuclear optical" » "articles and nuclear option", "articles and nuclear medical", "articles and nonlinear optical"

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: (("article and nuclear physics") OR ((("articles and nuclear physics") OR ((("articles and nuclear physical") OR ("articles and nuclear optical")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"article and nuclear physics\") or (((\"articles and nuclear physics\") or (((\"articles and nuclear physical\") OR (\"articles and nuclear optical\"))))))".
• Removing quotes may allow a broader search: (( article and nuclear physics ) or ((( articles and nuclear physics ) or ((( articles and nuclear physical ) OR ( articles and nuclear optical )))))).
• Adding a wildcard symbol may retrieve word variants: (("article and nuclear physics") or ((("articles and nuclear physics") or ((("articles and nuclear physical") OR ("articles and nuclear optical"))))))*.