Perhaps you should try some spelling variations:
"python using metal snippets" » "python using real snippets", "python nursing mental snippets", "python using medical snippets"
"locating bug core snippets" » "locating bug code snippets"
"dan tu code snippets" » "dan bug code snippets", "danh tu code snippets", "dan su code snippets", "ban tu code 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: (((("dan tu code snippets") or ("python using metal snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan tu code snippets") OR ("python using metal snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dan tu code snippets ) or ( python using metal snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan tu code snippets") or ("python using metal snippets"))) or ("locating bug core snippets"))*.