Perhaps you should try some spelling variations:
integration convolution » integration conclusion, integration evolution, integration construction
convolution problems » evolution problems, conclusion problems, consolidation problems
based microarray » based microarrays, cancer microarray, a microarray
microarray https » microarrays https, microarray chips, microscopy https
problems based » problem based, problems cases

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• Performing a fuzzy search may retrieve terms with similar spellings: integration convolution problems based microarray https~.
• Adding a wildcard symbol may retrieve word variants: integration convolution problems based microarray https*.