Perhaps you should try some spelling variations:
"index models mathematical" » "index modern mathematical", "index soils mathematical", "index modelling mathematical", "induced models mathematical"
"index model mathematics" » "index models mathematics", "index model mathematical", "index modeling mathematics"
"india modern mathematics" » "india model mathematics", "indonesia modern mathematics", "dunia 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 ("india modern mathematics"))) OR ("index models mathematical"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"index model mathematics\") OR (\"india modern mathematics\"))) OR (\"index models mathematical\"))".
• Removing quotes may allow a broader search: (((( index model mathematics ) OR ( india modern mathematics ))) OR ( index models mathematical )).
• Adding a wildcard symbol may retrieve word variants: (((("index model mathematics") OR ("india modern mathematics"))) OR ("index models mathematical"))*.