Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoan le don snippets" » "khoan ke don snippets", "hon le don snippets", "khoan va don snippets", "khoan le doan snippets", "khoan le dong snippets", "khoan le dan 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: (((("khoan le 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: (((("khoan le don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoan le don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoan le don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.