Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc dung co snippets" » "duc hung co snippets", "duc cuong co snippets", "duc phung co snippets", "duc dung cho snippets", "duc dung cong snippets", "duc dung cua 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 dung co 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 dung co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc dung co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc dung co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.