Perhaps you should try some spelling variations:
"index modeling mathematics" » "index modeling mathematical", "index modelling mathematical", "index mastering mathematics", "index modelling mathematics", "india modeling mathematics", "indices modeling mathematics"
"index model mathematics" » "index models mathematics", "index model mathematical", "index models mathematical"
"index modern mathematics" » "index models mathematics", "india modern mathematics", "indian modern mathematics"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("index model mathematics") OR ((("index modern mathematics") OR ("index modeling mathematics"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"index model mathematics\") OR (((\"index modern mathematics\") OR (\"index modeling mathematics\"))))".
• Removing quotes may allow a broader search: (( index model mathematics ) OR ((( index modern mathematics ) OR ( index modeling mathematics )))).
• Adding a wildcard symbol may retrieve word variants: (("index model mathematics") OR ((("index modern mathematics") OR ("index modeling mathematics"))))*.