Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa va du snippets" » "khoan va du snippets", "khoa ma du snippets", "hoa va du snippets", "khoa va dau snippets", "khoa va su snippets", "khoa va tu 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 va du 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 va du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa va du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa va du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.