Perhaps you should try some spelling variations:
"_ development strategies." » "_ development strategy."
"mine development services." » "mine development process.", "sme development services.", "trade development services.", "business development services."
"a development studies." » "a development series.", "a development strategy.", "a development policies."

Try widening your search to All Fields.

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