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