Perhaps you should try some spelling variations:
"van viet code snippets" » "van viet co snippets", "van viet some snippets", "san viet code snippets", "gian viet code snippets", "tran viet code snippets"
"dung nhan code snippets" » "dung luan code snippets", "dung nhan co snippets", "dung nhan con snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van viet code snippets") OR ("dung nhan code snippets"))) OR ("locating bug code slippers"))~.
• Removing quotes may allow a broader search: (((( van viet code snippets ) or ( dung nhan code snippets ))) or ( locating bug code slippers ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van viet code snippets") or ("dung nhan code snippets"))) or ("locating bug code slippers"))*.