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

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: (((("index modern mathematics") OR ("index model mathematics"))) OR ("inner loop mathematical"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"index modern mathematics\") OR (\"index model mathematics\"))) or (\"inner loop mathematical\"))~".
• Removing quotes may allow a broader search: (((( index modern mathematics ) OR ( index model mathematics ))) or ( inner loop mathematical ))~.
• Adding a wildcard symbol may retrieve word variants: (((("index modern mathematics") OR ("index model mathematics"))) or ("inner loop mathematical"))*.