Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nan cao cong snippets" » "nan cac cong snippets", "nan cao dang snippets", "nan cua cong snippets", "nang cao cong snippets", "nam cao cong snippets", "toan cao 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: (((("nan cao 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: (((("nan cao cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nan cao cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nan cao cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.