Perhaps you should try some spelling variations:
introduction hydroinformatics » introduction information, introduction hydrodynamics
hydroinformatics method » bioinformatics method, bioinformatics methods, ecoinformatics methods
method recursive » methods recursive, method discursive, other recursive
recursive array » recursive warrant, recursion arrays, receive array
array formulas » area formulas, harrop formulas, array format

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