Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"duc toan hoat snippets" » "duc toan khoa snippets", "duc toan hoc snippets", "duc toan ho snippets", "duc tan hoat snippets", "duc ton hoat snippets", "duc hoan hoat snippets"
"locating bug core snippets" » "locating bug code snippets"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("duc toan hoat snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( duc toan hoat snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("duc toan hoat snippets"))) or ("locating bug core snippets"))*.