Perhaps you should try some spelling variations:
"dung nam trong slippers" » "dung nam trung slippers", "dung cay trong slippers", "dong nam trong slippers", "dung lam trong slippers", "sung nam trong slippers", "dung nam trong slippery", "dung nam 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 nam 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 nam trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nam trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nam trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.