Perhaps you should try some spelling variations:
"dung luan code snippets" » "dung luan cong snippets", "dung luan che snippets", "dung luan de snippets", "dung luan code slippers"
"tang van code snippets" » "dang van code snippets", "hoang van code snippets", "trong van code snippets", "tang van de snippets", "tang van hoe snippets", "tang van cong snippets", "tang van code 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 luan code snippets\") OR (\"tang van code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung luan code snippets ) OR ( tang van code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung luan code snippets") OR ("tang van code snippets"))) OR ("locating bug code snippets"))*.