Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dung luan 15 slippers" » "dung quan 15 slippers", "dung lan 15 slippers", "dung luan 15 slippery", "dung luan 15 grippers"
"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: (((("dung luan 15 slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung luan 15 slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luan 15 slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luan 15 slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.