Perhaps you should try some spelling variations:
"dung quan viet slippers" » "dung quang viet slippers", "dung luan viet slippers", "luong quan viet slippers", "dung xuan viet slippers", "dung gian viet slippers", "dung san viet slippers", "dung quan viet slippery", "dung quan viet 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 quan viet 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 quan viet slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung quan viet slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung quan viet slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.