Perhaps you should try some spelling variations:
"e development strategies." » "e development strategy.", "sme development strategies.", "site development strategies.", "trade development strategies."
"mine development studies." » "mine development services.", "mine development strategy.", "mine development policies.", "sme development studies.", "trade development studies.", "business development studies.", "minsme development studies.", "minsite development studies.", "mintrade development studies."
"a development series." » "a development services.", "a development agencies.", "a development strategy."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("mine development studies.") or ("e development strategies."))) or ("a development series."))~.
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• Adding a wildcard symbol may retrieve word variants: (((("mine development studies.") or ("e development strategies."))) or ("a development series."))*.