Perhaps you should try some spelling variations:
"cong nhat phi slippers" » "cong nhan phi slippers", "cong ha phi slippers", "cong suat phi slippers", "cong nhat mpsi slippers", "cong nhat pcsi slippers", "cong nhat phep slippers", "cong nhat phi slippery", "cong nhat phi 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: (((("cong nhat phi slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong nhat phi slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong nhat phi slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong nhat phi slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.