Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc doi den snippets" » "cuoc doi den snippets", "quoc hoi den snippets", "luoc doi den snippets", "quoc doi dien snippets", "quoc di den snippets", "quoc doi 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: (((("quoc doi 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: (((("quoc doi den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc doi den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc doi den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.