Perhaps you should try some spelling variations:
"dung viet lua slippers" » "nang viet lua slippers", "cong viet lua slippers", "mang viet lua slippers", "dung viet qua slippers", "dung viet quan slippers", "dung viet tuan slippers", "dung viet lua slippery", "dung viet lua 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 viet lua 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 viet lua slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung viet lua slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung viet lua slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.