Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den thi hoa snippets" » "dien thi hoa snippets", "de thi hoa snippets", "dan thi hoa snippets", "den thi hoan snippets", "den thi ha snippets", "den thi hong 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: (((("den thi hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den thi hoa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den thi hoa snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den thi hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.