Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa dan che snippets" » "khoa dang che snippets", "hoa dan che snippets", "khoa can che snippets", "khoa han che snippets", "khoa dan cho snippets", "khoa dan he 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: (((("khoa dan che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa dan che snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa dan che snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa dan che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.