Perhaps you should try some spelling variations:
"dung trung lua slippers" » "dung trong lua slippers", "quang trung lua slippers", "truong trung lua slippers", "dung trung cua slippers", "dung trung luc slippers", "dung trung lua slippery", "dung trung lua 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 java java snippets") or ("dung trung lua slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dung trung lua slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung trung lua slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung trung lua slippers"))) or ("locating bug code snippets"))*.