Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"moi cong don snippets" » "noi cong don snippets", "voi cong don snippets", "tai cong don snippets", "moi cong dong snippets", "moi cong doan snippets", "moi cong dan 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: (((("moi cong don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("moi cong don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( moi cong don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("moi cong don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.