Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dac khoa de snippets" » "da khoa de snippets", "dai khoa de snippets", "dau khoa de snippets", "dac khoa dr snippets", "dac khoa he snippets", "dac khoi de 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: (((("dac khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dac khoa de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dac khoa de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dac khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.