Perhaps you should try some spelling variations:
"dung phan viet slippers" » "dung nhan viet slippers", "dung luan viet slippers", "dung ha viet slippers", "dung phap viet slippers", "dung han viet slippers", "dung pham viet slippers", "dung phan viet slippery", "dung phan 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 phan 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 phan viet slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung phan viet slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung phan viet slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.