Perhaps you should try some spelling variations:
"nguyen nam a snippets" » "nguyen nang a snippets", "nguyen van a snippets", "nguyen can a snippets", "nguyen nam va snippets", "nguyen nam _ snippets", "nguyen nam a slippers"
"python using java snippets" » "python using data snippets", "python using java 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 nam a 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 nam a snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nguyen nam a snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen nam a snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.