Talvez debería tentar con algunhas variantes ortográficas:
"index model mathematics" » "index models mathematics", "index model mathematical", "index modeling mathematics"
"index modern mathematics" » "index models mathematics", "index modeling mathematics", "indian modern mathematics"
"india modern mathematics" » "india model mathematics", "indonesia modern mathematics", "dunia modern mathematics"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("index model mathematics") OR ((("index modern mathematics") OR ("india modern mathematics")))).
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• Removing quotes may allow a broader search: (( index model mathematics ) or ((( index modern mathematics ) OR ( india modern mathematics )))).
• Adding a wildcard symbol may retrieve word variants: (("index model mathematics") or ((("index modern mathematics") OR ("india modern mathematics"))))*.