Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong tan son snippets" » "cong tac son snippets", "cong san son snippets", "cong thanh son snippets", "cong tang son snippets", "cong van son snippets", "cong tay son 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: (((("cong tan son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong tan son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong tan son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong tan son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.