Perhaps you should try some spelling variations:
optimisation problems » optimization problems, optimization problem
linear optimisation » linear optimization, nonlinear optimisation, library optimisation
https microarray » data microarray, cells microarray, genes microarray
chip microarray » cdna microarray, liu microarray, p microarray

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• Performing a fuzzy search may retrieve terms with similar spellings: linear optimisation problems ((https microarray) OR (chip microarray)) chips~.
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