Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan den hoc snippets" » "quan den hoc snippets", "luan de hoc snippets", "luan len hoc snippets", "luan dien hoc snippets", "luan dan 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: (((("luan 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: (((("luan den hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan den hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan den hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.