Perhaps you should try some spelling variations:
introduction contractor » introduction contracts, introduction contractual, introduction construction
contractor programme » contractor's programme, contraction programmed, contractor programming
function microarray » function microarrays, functional microarray, function micrornas
programme function » programming function, programme action, programs functional
microarray https » microarrays https, microarray chips, microscopy https

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• Performing a fuzzy search may retrieve terms with similar spellings: introduction contractor programme function microarray https~.
• Adding a wildcard symbol may retrieve word variants: introduction contractor programme function microarray https*.