Perhaps you should try some spelling variations:
computation purchasing » computation chasing, computation using, computers purchasing
numeric computation » numerical computation, numerical computations, numeric computing
purchasing program » nursing program, processing program, purchasing process
program microarray » proteome microarray, from microarray, protein microarray
microarray https » microarrays https, microarray chips, microscopy https

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: numeric computation purchasing program microarray https~.
• Adding a wildcard symbol may retrieve word variants: numeric computation purchasing program microarray https*.