Perhaps you should try some spelling variations:
introduction interventional » introduction international, introduction intervertebral, introductions international
interventional method » interventional methods, intervention method, intervention methods
method recursive » methods recursive, method discursive, other recursive
recursive array » recursive warrant, recursion arrays, receive array
array formats » array format, assay formats, array formulas

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• Adding a wildcard symbol may retrieve word variants: introduction interventional method recursive array formats*.