Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan hoang le snippets" » "dang hoang le snippets", "van hoang le snippets", "quan hoang le snippets", "dan hoang de snippets", "dan hong le snippets", "dan hoang lam 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 hoang le 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 hoang le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan hoang le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan hoang le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.