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