Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc khoi de snippets" » "duc khoa de snippets", "luc khoi de snippets", "buoc khoi de snippets", "duc khi de snippets", "duc khoi he 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 khoi de 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 khoi de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc khoi de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc khoi de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.