Perhaps you should try some spelling variations:
"smi learning resources theories." » "smi learning resource theories.", "smi learning resources series.", "smi learning resources theory.", "wbi learning resources theories.", "i learning resources theories.", "ii learning resources theories."
"3 teaching resource survey." » "3 teaching resources survey.", "3 teaching research survey.", "3 learning resource survey.", "3 teaching resources surveys.", "3 teaching resource curse.", "3 teaching resource security.", "1 teaching resource survey.", "4 teaching resource survey.", "10 teaching resource survey."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("smi learning resources theories.") or ("3 teaching resource survey."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("smi learning resources theories.") OR ("3 teaching resource survey.")).
• Removing quotes may allow a broader search: (( smi learning resources theories. ) or ( 3 teaching resource survey. )).
• Adding a wildcard symbol may retrieve word variants: (("smi learning resources theories.") or ("3 teaching resource survey."))*.