Perhaps you should try some spelling variations:
introduction contentious » introduction contentions, introduction continuous, introduction conventional
contentious programming » conventions programming, continuous programming, concepts programming
programming function » programming functional, programming functionals, programme function
function microarray » function microarrays, functional microarray, function micrornas
microarray https » microarrays https, microarray chips, microscopy https

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• Adding a wildcard symbol may retrieve word variants: introduction contentious programming function microarray https*.