Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"dan dung open snippets" » "dan dung tren snippets", "dan dung nen snippets", "dan dung len snippets", "van dung open snippets", "tin dung open snippets", "ap dung open 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: "((((\"using java java snippets\") OR (\"dan dung open snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java java snippets ) OR ( dan dung open snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") OR ("dan dung open snippets"))) OR ("locating bug code snippets"))*.