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