Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vuc van du snippets" » "duc van du snippets", "luc van du snippets", "thuc van du snippets", "vuc van duy snippets", "vuc van dau snippets", "vuc 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: (((("vuc 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: (((("vuc van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vuc van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vuc van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.