Perhaps you should try some spelling variations:
"nhan sinh trac slippers" » "nhan sinh thai slippers", "nhan sinh thuc slippers", "nhan anh trac slippers", "phan sinh trac slippers", "nhan sinh trac slippery", "nhan sinh trac grippers"
"dung java java snippets" » "dung va java 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: (((("nhan sinh trac slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhan sinh trac slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhan sinh trac slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhan sinh trac slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.