Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan vi he snippets" » "doan va he snippets", "don vi he snippets", "doan thi he snippets", "doan vi ha snippets", "doan gi he 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: (((("doan vi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan vi he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan vi he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan vi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.