Perhaps you should try some spelling variations:
imperative programmers » imperative programs, operative programme, imperative program
imperative programming » declarative programming, reactive programming
function microarray » function microarrays, functional microarray, function micrornas
microarray chips » microarray chip, microarrays chip, microarray cross

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

• Performing a fuzzy search may retrieve terms with similar spellings: programming ((imperative programmers) OR (imperative programming)) function microarray chips~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "programming ((imperative programmers) OR (imperative programming)) function microarray chips".
• Adding a wildcard symbol may retrieve word variants: programming ((imperative programmers) OR (imperative programming)) function microarray chips*.