Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nghe thi mon snippets" » "nghe thu mon snippets", "nghiem thi mon snippets", "nghe thuc mon snippets", "nghe thi mo snippets", "nghe thi moi snippets", "nghe thi 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: (((("nghe thi mon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nghe thi mon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nghe thi mon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nghe thi mon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.