Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc cong dot snippets" » "duc cuong dot snippets", "dung cong dot snippets", "nuoc cong dot snippets", "duc cong mot snippets", "duc cong dong snippets", "duc cong doan 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: (((("duc cong dot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc cong dot snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc cong dot snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc cong dot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.