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