Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoe van du snippets" » "khoe ban du snippets", "khoe va du snippets", "khoe quan du snippets", "khoe van duy snippets", "khoe van dau snippets", "khoe van de 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: (((("khoe van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoe van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoe van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoe van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.