Perhaps you should try some spelling variations:
"cong trinh code slippers" » "cong trinh cong slippers", "cong trinh co slippers", "cong trinh cad slippers"
"dung trong dan snippets" » "dung trong dang snippets", "dung trong san snippets", "dung trong tan snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("dung trong dan snippets") or ("cong trinh code slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung trong dan snippets") OR ("cong trinh code slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung trong dan snippets ) or ( cong trinh code slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung trong dan snippets") or ("cong trinh code slippers"))) or ("locating bug code snippets"))*.