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