Perhaps you should try some spelling variations:
integer formulation » integral formulation, integral formulations, integer permutations
formulation program » simulation program, population program, formulation problem
problem microarray » probe microarray, proteome microarray, from microarray
microarray https » microarrays https, microarray chips, microscopy https
program problem » programs problem, programs problems, program program

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