Perhaps you should try some spelling variations:
"nha hoc trinh snippets" » "nha doc trinh snippets", "nha hoc tinh snippets", "nha hoc sinh snippets", "nha thuoc trinh snippets", "khoa hoc trinh snippets", "nha nuoc trinh snippets", "nha 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"

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: (((("nha 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: (((("nha hoc trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nha hoc trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nha hoc trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.