Perhaps you should try some spelling variations:
"dung cac doanh slippers" » "dung cac dan slippers", "dung cac dang slippers", "dung van doanh slippers", "luong cac doanh slippers", "dung cho doanh slippers", "dung tai doanh slippers", "dung cac doanh slippery", "dung cac 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 cac 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 cac doanh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cac doanh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cac doanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.