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