Perhaps you should try some spelling variations:
"Learn by doing: glass theory, more results" » "Learn by doing: class theory, more results", "Learn by doing: glasses theory, more results", "Learn by doing: mass theory, more results"
"learn by doing: less theory, late results" » "learn by doing: less theory, related results", "learn by doing: lens theory, late results", "learn by doing: loss theory, late results", "learn by doing: class theory, late results"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("Learn by doing: glass theory, more results") OR ("learn by doing: less theory, late results")).
• Removing quotes may allow a broader search: (( Learn by doing: glass theory, more results ) or ( learn by doing: less theory, late results )).
• Adding a wildcard symbol may retrieve word variants: (("Learn by doing: glass theory, more results") or ("learn by doing: less theory, late results"))*.