Perhaps you should try some spelling variations:
"dung dan trac snippets" » "dung dat trac snippets", "dung san trac snippets", "tung dan trac snippets", "dung dan tra snippets", "dung dang tran snippets", "dung dien trac snippets", "dung dan trac slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho code slippers"
"locating bug code 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 dan trac snippets\") OR (\"dung cho code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung dan trac snippets ) OR ( dung cho code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung dan trac snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets"))*.