Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lam van cong snippets" » "lam van dong snippets", "lam van phong snippets", "lam phan cong snippets", "lam san cong snippets", "nam van cong snippets", "dam van cong 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 cong 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 cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lam van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lam van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.