Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nhat dan den snippets" » "nhat danh den snippets", "nhat ban den snippets", "nhan dan den snippets", "nhat van den snippets", "nhat dan dung 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: (((("nhat dan 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: (((("nhat dan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhat dan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhat dan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.