Perhaps you should try some spelling variations:
introduction current » introduction case
programmes problems » programs problems, programming problems, programmer's problem
problems microarray » probe microarray, protein microarray, proteins microarray
current programmes » current programmed, currents programmed, current programs
microarray https » microarrays https, microarray chips, microscopy https

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• Performing a fuzzy search may retrieve terms with similar spellings: introduction current programmes problems microarray https~.
• Adding a wildcard symbol may retrieve word variants: introduction current programmes problems microarray https*.