Perhaps you should try some spelling variations:
"doi quy trinh slippers" » "doi qua trinh slippers", "doi quy dinh slippers", "dot quy trinh slippers", "doi duy trinh slippers", "noi quy trinh slippers", "doi quy trinh slippery", "doi quy trinh grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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: (((("doi quy trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi quy trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi quy trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi quy trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.