Perhaps you should try some spelling variations:
practising structured » processing structured, processing structure, practical structured
regression practising » regression writing
structured microarray » structure microarray, directed microarray
sparse regression » square regression, shape regression, stepwise regression
microarray https » microarrays https, microarray chips, microscopy https

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• Performing a fuzzy search may retrieve terms with similar spellings: sparse regression practising structured microarray https~.
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