Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan van con snippets" » "doan va con snippets", "hoang van con snippets", "luan van con snippets", "doan van cong snippets", "doan van bon snippets", "doan van co 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 van con 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 van con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan van con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan van con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.