Perhaps you should try some spelling variations:
function relation » function relations, function regulation, function section
program tutorials » programs tutorials, programming tutorials, diagrams tutorials
programs tutorial » programs tutorials, problems tutorial, programming tutorial
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: function relation ((program tutorials) OR (programs tutorial)) microarray chips~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "function relation ((program tutorials) OR (programs tutorial)) microarray chips".
• Adding a wildcard symbol may retrieve word variants: function relation ((program tutorials) OR (programs tutorial)) microarray chips*.