Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dia danh hoc snippets" » "dia ban hoc snippets", "gia dinh hoc snippets", "dia dan hoc snippets", "dia danh hoa snippets", "dia 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: (((("dia 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: (((("dia danh hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dia danh hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dia danh hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.