Perhaps you should try some spelling variations:
"mine development strategies." » "mine development strategy.", "sme development strategies.", "trade development strategies.", "business development strategies."
"sma development africa." » "smart development africa.", "small development africa.", "asia development africa.", "sa development africa.", "smena development africa.", "s2 development africa."
"ma development africa." » "a development africa.", "mena development africa.", "2 development africa."

Try widening your search to All Fields.

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