Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khong co don snippets" » "thong co don snippets", "khong lo don snippets", "khong bao don snippets", "khong co dong snippets", "khong co dan snippets", "khong co dot 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: (((("khong co don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khong co don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khong co don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khong co don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.