Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"tran dung hoc snippets" » "tran dang hoc snippets", "tran hung hoc snippets", "tran quang hoc snippets", "tran dong hoc snippets", "tran dung thuoc snippets", "tran trung hoc 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 ("tran dung hoc snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( tran dung hoc snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("tran dung hoc snippets"))) or ("locating bug core snippets"))*.