Perhaps you should try some spelling variations:
"dung doan cap snippets" » "dung doanh cap snippets", "dung dan cap snippets", "dung toan cap snippets", "dung doanh cao snippets", "dung dan ca snippets", "dung toan cao snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 doan cap snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung doan cap snippets ) OR ( dung java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung doan cap snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets"))*.