Perhaps you should try some spelling variations:
"dong hieu code snippets" » "dung hieu code snippets", "dong trieu code snippets", "doc hieu code snippets", "dong hieu core snippets", "dong hieu code slippers"
"dung de code snippets" » "dung he code snippets", "dung dat code snippets", "dung de core snippets", "dung de code slippers"
"locating bug code snippets" » "locating bug core 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 de code snippets\") OR (\"dong hieu code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung de code snippets ) OR ( dong hieu code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung de code snippets") OR ("dong hieu code snippets"))) OR ("locating bug code snippets"))*.