Perhaps you should try some spelling variations:
programs structures » program structures, programs structured, programs structuring
programs interface » programs interfaces, program interfaces, diagrams interface
program structure » protein structure, from structure, product structure
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: programs interface ((programs structures) OR (program structure)) microarray chips~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "programs interface ((programs structures) OR (program structure)) microarray chips".
• Adding a wildcard symbol may retrieve word variants: programs interface ((programs structures) OR (program structure)) microarray chips*.