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