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