Perhaps you should try some spelling variations:
"dung trinh khai slippers" » "dung tinh khai slippers", "dong trinh khai slippers", "cong trinh khai slippers", "dung trinh kham slippers", "dung trinh han slippers", "dung trinh tai slippers", "dung trinh khai slippery", "dung trinh khai 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 trinh khai 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 trinh khai slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung trinh khai slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung trinh khai slippers"))) or ("locating bug code snippets"))*.