Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"duc toan vo snippets" » "duc tan vo snippets", "duc ton vo snippets", "duc hoan vo snippets", "duc toan von snippets", "duc toan ho snippets", "duc toan va 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: (((("duc toan vo snippets") or ("python using java snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc toan vo snippets") OR ("python using java snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( duc toan vo snippets ) or ( python using java snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc toan vo snippets") or ("python using java snippets"))) or ("locating bugs code snippets"))*.