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