Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa dan den snippets" » "khoa dang den snippets", "hoa dan den snippets", "khoa can den snippets", "khoa ban den snippets", "khoa van den snippets", "khoa dan dung 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 dan den 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 dan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa dan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa dan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.