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