Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa thu dk snippets" » "khoa than dk snippets", "hoai thu dk snippets", "ho thu dk snippets", "khoa thu da snippets", "khoa thu do 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 thu dk 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 thu dk snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa thu dk snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa thu dk snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.