Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam van long snippets" » "nam van luong snippets", "nam van dong snippets", "nam van cong snippets", "nam dan long snippets", "nam va long snippets", "pham van long 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: (((("nam van long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nam van long snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam van long snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam van long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.