Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toan van hoe snippets" » "tran van hoe snippets", "toan ban hoe snippets", "tan van hoe snippets", "toan van hoa snippets", "toan van hoc snippets", "toan van hieu 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: (((("toan van hoe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toan van hoe snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan van hoe snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan van hoe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.