Perhaps you should try some spelling variations:
"index models mathematics" » "index model mathematics", "index models mathematical", "index modeling mathematics", "induced models mathematics"
"inner loop mathematical" » "inner flood mathematical", "inner floods mathematical", "inner group mathematical", "inner blood mathematical"
"index modern mathematics" » "index model mathematics", "india modern mathematics", "index modeling mathematics"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("index modern mathematics") OR ("index models mathematics"))) or ("inner loop mathematical"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("index modern mathematics") OR ("index models mathematics"))) OR ("inner loop mathematical")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"index modern mathematics\") OR (\"index models mathematics\"))) or (\"inner loop mathematical\"))".
• Removing quotes may allow a broader search: (((( index modern mathematics ) OR ( index models mathematics ))) or ( inner loop mathematical )).
• Adding a wildcard symbol may retrieve word variants: (((("index modern mathematics") OR ("index models mathematics"))) or ("inner loop mathematical"))*.