Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets", "using java java slippers"
"phan duc trac snippets" » "pham duc trac snippets", "phan tu trac snippets", "phan dau trac snippets", "phan duc thach snippets", "phan duc tan snippets", "phan duc toan snippets", "phan duc 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: "((((\"phan duc trac snippets\") OR (\"using java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( phan duc trac snippets ) OR ( using java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("phan duc trac snippets") OR ("using java java snippets"))) OR ("locating bug code snippets"))*.