Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc man dong snippets" » "duc van dong snippets", "duc dan dong snippets", "duc can dong snippets", "duc manh dong snippets", "duc tan dong snippets", "duc mau dong 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: (((("duc man dong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc man dong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc man dong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc man dong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.