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