Perhaps you should try some spelling variations:
optimisation problems » optimization problems, optimization problem
integer optimisation » integer optimization, integer optimizationof, linear optimisation
https microarray » data microarray, cells microarray, chip microarray
microarray https » microarrays https, microarray chips, microscopy https
problems https » programs https, problems hints, problems help

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• Performing a fuzzy search may retrieve terms with similar spellings: integer optimisation problems https microarray https~.
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