Perhaps you should try some spelling variations:
"dung thanh hoc snippets" » "dong thanh hoc snippets", "dang thanh hoc snippets", "dung thang hoc snippets", "dung thanh hoa snippets", "dung than hoc snippets", "dung thanh ho 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 thanh hoc snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung thanh hoc snippets ) OR ( dung java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung thanh hoc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets"))*.