Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan hieu he snippets" » "danh hieu he snippets", "van hieu he snippets", "dao hieu he snippets", "dan hieu ve snippets", "dan hiem he snippets", "dan hieu le 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 hieu he 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 hieu he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan hieu he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan hieu he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.