Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan thi hoa snippets" » "luan chi hoa snippets", "luan thiet hoa snippets", "luyen thi hoa snippets", "luan thi hoan snippets", "luan thi ha snippets", "luan thi hong 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 thi hoa 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 thi hoa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan thi hoa snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan thi hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.