Perhaps you should try some spelling variations:
"index early mathematics" » "index ecology mathematics", "index supply mathematics", "index fuzzy mathematics", "indies early mathematics", "india early mathematics", "induced early mathematics"
"Index learn mathematics" » "Index learning mathematics", "Index modern mathematics"
index theory » index theorem
index learn » index learning, index lesion, index search

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