Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"day danh hoc snippets" » "day manh hoc snippets", "dai danh hoc snippets", "dao danh hoc snippets", "day dan hoc snippets", "day danh hoa snippets", "day anh hoc 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: (((("day danh hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("day danh hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( day danh hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("day danh hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.