Perhaps you should try some spelling variations:
"dung nhap doanh slippers" » "dung nhuan doanh slippers", "dung lap doanh slippers", "dung nhan doanh slippers", "dung nha doanh slippers", "dung nhat doanh slippers", "dung nhap doanh slippery", "dung nhap doanh 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 nhap doanh 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 nhap doanh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nhap doanh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nhap doanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.