Perhaps you should try some spelling variations:
"dung lenin dinh slippers" » "dung len dinh slippers", "dung lenin danh slippers", "dung lenin kinh slippers", "dung lenin dung slippers", "dung lenin dinh slippery", "dung lenin dinh 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 lenin dinh 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 lenin dinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung lenin dinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung lenin dinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.