Perhaps you should try some spelling variations:
functionals microarray » functional microarray, function microarrays, functional microrna
problem functionals » problem functional, problems functions, probing functional
programming active » programming native, programming practice, programming inductive
microarray chips » microarray chip, microarrays chip, microarray cross
active problem » active problems, action problem, native problem

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• Performing a fuzzy search may retrieve terms with similar spellings: programming active problem functionals microarray chips~.
• Adding a wildcard symbol may retrieve word variants: programming active problem functionals microarray chips*.