Perhaps you should try some spelling variations:
"dat hoc trinh snippets" » "dat doc trinh snippets", "dat hoc tinh snippets", "dat hoc sinh snippets", "dai hoc trinh snippets", "vat hoc trinh snippets", "dan hoc trinh snippets", "dat hoc trinh slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

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