Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu hoc den snippets" » "lieu hoc den snippets", "hieu hoa den snippets", "tieu hoc den snippets", "hieu hoc dan snippets", "hieu hoc de snippets", "hieu hoc hien 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: (((("hieu hoc den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu hoc den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu hoc den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu hoc den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.