Perhaps you should try some spelling variations:
estimation microarray » activation microarray, annotation microarray, evolution microarray
programming function » programming functional, programming functionals, programme function
variogram estimation » program estimation, variance estimation, variables estimation
function variogram » function program
microarray https » microarrays https, microarray chips, microscopy https

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• Performing a fuzzy search may retrieve terms with similar spellings: programming function variogram estimation microarray https~.
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