Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan dung led snippets" » "van dung led snippets", "tin dung led snippets", "ap dung led snippets", "dan dung le snippets", "dan dung len snippets", "dan dung land 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: (((("dan dung led snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan dung led snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan dung led snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan dung led snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.