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