Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"using ph trac snippets" » "using pre trac snippets", "using a trac snippets", "using _ trac snippets", "using phan trac snippets", "using pho trach snippets", "using thi trac snippets", "using ph trac slippers"
"locating bug code snippets" » "locating bug code slippers", "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 java java snippets\") OR (\"using ph trac snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( using ph trac snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("using ph trac snippets"))) OR ("locating bug code snippets"))*.