Perhaps you should try some spelling variations:
"cong danh het slippers" » "cuong danh het slippers", "cong dan het slippers", "cong thanh het slippers", "cong danh viet slippers", "cong danh hieu slippers", "cong danh bat slippers", "cong danh het slippery", "cong danh het 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 danh het 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 danh het slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong danh het slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong danh het slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.