Perhaps you should try some spelling variations:
"dung khoa trinh slippers" » "dung khoa tinh slippers", "dung kha trinh slippers", "dung khoan trich slippers", "dung cho trinh slippers", "dung khoa trinh slippery", "dung khoa trinh 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 khoa trinh 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 khoa trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung khoa trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung khoa trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.