Perhaps you should try some spelling variations:
"web mine development countries problems." » "web mine developing countries problems.", "web mine developed countries problems.", "web mine development congresses problems.", "web sme development countries problems.", "web trade development countries problems.", "web business development countries problems.", "web money development countries problems.", "webb mike development countries problems.", "web site development countries problems."
"das software development community practices." » "das software development common practices.", "das software development communication practices.", "das software development communicative practices.", "dal software development community practices.", "desk software development community practices.", "der software development community practices."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("das software development community practices.") or ("web mine development countries problems."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("das software development community practices.") OR ("web mine development countries problems.")).
• Removing quotes may allow a broader search: (( das software development community practices. ) or ( web mine development countries problems. )).
• Adding a wildcard symbol may retrieve word variants: (("das software development community practices.") or ("web mine development countries problems."))*.