Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa len con snippets" » "khoa luan con snippets", "khoa benh con snippets", "khoa he con snippets", "khoa len cong snippets", "khoa lon con snippets", "khoa le con 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: (((("khoa len con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa len con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa len con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa len con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.