Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua duy doc snippets" » "qua huy doc snippets", "qua du doc snippets", "quang duy doc snippets", "qua day doc snippets", "qua duy dac snippets", "qua 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: (((("qua 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: (((("qua duy doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua duy doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua duy doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.