Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"co buon cong snippets" » "co bon cong snippets", "co luong cong snippets", "co duong cong snippets", "co buong cong snippets", "co xuong cong 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: (((("co buon cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co buon cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( co buon cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co buon cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.