Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toan de do snippets" » "toan du do snippets", "toan ke do snippets", "toan ve do snippets", "toan de dao snippets", "toan den do snippets", "toan de doi 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 de do 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 de do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan de do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan de do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.