Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luu luan doi snippets" » "luc luan doi snippets", "lau luan doi snippets", "luu lan doi snippets", "luu quan doi snippets", "luu lua doi snippets", "luu luan gioi 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: (((("luu luan doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luu luan doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luu luan doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luu luan doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.