Perhaps you should try some spelling variations:
structures microarray » structure microarray, structured microarray, studies microarray
program structures » program structure, protein structures
reference during » preferences during, reference string, reference using
microarray chips » microarray chip, microarrays chip, microarray cross
during program » nursing program, using program, during programmed

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• Performing a fuzzy search may retrieve terms with similar spellings: reference during program structures microarray chips~.
• Adding a wildcard symbol may retrieve word variants: reference during program structures microarray chips*.