Perhaps you should try some spelling variations:
"dung len doanh slippers" » "dung lien doanh slippers", "dung ly doanh slippers", "dung van doanh slippers", "dung nen doanh slippers", "dung le doanh slippers", "dung luan doanh slippers", "dung len doanh slippery", "dung len 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 len 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 len doanh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung len doanh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung len doanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.