Perhaps you should try some spelling variations:
"dung trinh java snippets" » "dung tinh java snippets", "dong trinh java snippets", "cong trinh java snippets"
"dung dat hoc snippets" » "dung va hoc snippets", "dung tai hoc snippets", "dung dai hoc snippets", "dung vat hoc snippets", "dung dan hoc 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 dat hoc snippets\") OR (\"dung trinh java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung dat hoc snippets ) OR ( dung trinh java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung dat hoc snippets") OR ("dung trinh java snippets"))) OR ("locating bug code snippets"))*.