Perhaps you should try some spelling variations:
"trong khoa code snippets" » "truong khoa code snippets", "tuong khoa code snippets", "trung khoa code snippets", "trong khoa cong snippets", "trong khoa co snippets", "trong khoa de snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("trong khoa code snippets") or ("dung java java snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trong khoa code snippets") OR ("dung java java snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( trong khoa code snippets ) or ( dung java java snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("trong khoa code snippets") or ("dung java java snippets"))) or ("locating bug code slippers"))*.