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