Perhaps you should try some spelling variations:
"i teaching resources studies." » "i learning resources studies.", "i teaching resource studies.", "i teaching resources series.", "i teaching resonance studies.", "1 teaching resources studies.", "3 teaching resources studies.", "4 teaching resources studies."
"ii teaching resources studies." » "ii learning resources studies.", "ii teaching resource studies.", "ii teaching resources series.", "ii teaching resonance studies.", "1 teaching resources studies.", "10 teaching resources studies.", "3 teaching resources studies.", "i1 teaching resources studies.", "i3 teaching resources studies.", "i4 teaching resources studies."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("i teaching resources studies.") OR ("ii teaching resources studies."))~.
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• Removing quotes may allow a broader search: (( i teaching resources studies. ) OR ( ii teaching resources studies. )).
• Adding a wildcard symbol may retrieve word variants: (("i teaching resources studies.") OR ("ii teaching resources studies."))*.