Perhaps you should try some spelling variations:
"hoc trinh code snippets" » "hoc trinh cong snippets", "hoc trinh co snippets", "hoc trinh cad snippets", "doc trinh code snippets", "hoc tinh code snippets", "hoc sinh code snippets", "hoc trinh code slippers"
"dung va java snippets" » "dung java java snippets", "dung va java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("dung va java snippets") or ("hoc trinh code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung va java snippets") OR ("hoc trinh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung va java snippets ) or ( hoc trinh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung va java snippets") or ("hoc trinh code snippets"))) or ("locating bug code snippets"))*.