Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den duy doc snippets" » "den nguy doc snippets", "dien duc doc snippets", "dinh duy doc snippets", "den day doc snippets", "den duy dac snippets", "den duy dot 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: (((("den duy doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den duy doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den duy doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den duy doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.