Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den ket doan snippets" » "den ket hoa snippets", "den le doan snippets", "den ket van snippets", "dinh ket doan snippets", "lien ket doan snippets", "dong ket doan 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 ket doan 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 ket doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den ket doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den ket doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.