Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"day nghe so snippets" » "dang nghe so snippets", "van nghe so snippets", "nam nghe so snippets", "day nghe son snippets", "day nghe co snippets", "day nghiep so 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: (((("day nghe so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("day nghe so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( day nghe so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("day nghe so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.