Perhaps you should try some spelling variations:
"tra trinh code snippets" » "tra trinh cong snippets", "tra trinh co snippets", "tra trinh cad snippets", "qua trinh code snippets", "tra trinh code 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"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung java java snippets\") OR (\"tra trinh code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( tra trinh code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("tra trinh code snippets"))) OR ("locating bug code snippets"))*.