Perhaps you should try some spelling variations:
"dung sai trong slippers" » "dung tai trong slippers", "dung bai trong slippers", "dung dai trong slippers", "dung va trong slippers", "dung dat trong slippers", "dung sai trong slippery", "dung sai trong 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 sai trong 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 sai trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung sai trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung sai trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.