Perhaps you should try some spelling variations:
"dung dich trac snippets" » "dung sinh trac snippets", "dung bich tran snippets", "dung dich ran snippets", "luong dich trac snippets", "hang dich trac snippets", "dung dich trac slippers"
"using a code snippets" » "using a core snippets", "using a 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: "((((\"using a code snippets\") OR (\"dung dich trac snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using a code snippets ) OR ( dung dich trac snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") OR ("dung dich trac snippets"))) OR ("locating bug code snippets"))*.