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"
"anh java java snippets" » "anh va java snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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