Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ket dan hoc snippets" » "ket doan hoc snippets", "ke dan hoc snippets", "ket van hoc snippets", "ket dan toc snippets", "ket dai 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: (((("ket dan 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: (((("ket dan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ket dan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ket dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.