Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc hai lon snippets" » "cuc hai lon snippets", "duc dai lon snippets", "duc hau lon snippets", "duc hai long snippets", "duc bai lon snippets", "duc hai con 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 hai lon 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 hai lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc hai lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc hai lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.