Perhaps you should try some spelling variations:
"theoretical physicist" » "theoretical physicists", "theoretical physics", "theoretical geophysics"
"theoretical basicss" » "theoretical basics", "theoretical business", "theoretical bisacsh"
"theoretical basis" » "theoretical analysis"

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