Perhaps you should try some spelling variations:
integer formulation » integral formulation, integral formulations, integer permutations
formulation program » simulation program, population program, formulation problem
basic microarray » based microarray, bac microarray, based microarrays
microarray https » microarrays https, microarray chips, microscopy https
program basic » program based, programs based, programming basic

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• Adding a wildcard symbol may retrieve word variants: integer formulation program basic microarray https*.