Perhaps you should try some spelling variations:
"dung sang trong slippers" » "dung lang trong slippers", "dung mang trong slippers", "dung nang trong slippers", "dung san trong slippers", "dung dang trong slippers", "dung sang trong slippery", "dung sang 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 sang 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 sang trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung sang trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung sang trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.