Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"nguyen tu 20 snippets" » "nguyen thu 20 snippets", "nguyen thi 20 snippets", "nguyen duc 20 snippets", "nguyen tu 21 snippets", "nguyen tu 10 snippets", "nguyen tu 23 snippets", "nguyen tu 20 slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("nguyen tu 20 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nguyen tu 20 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nguyen tu 20 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen tu 20 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.