Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"van toan hat snippets" » "van tuan hat snippets", "van tan hat snippets", "van thanh hat snippets", "van toan hoat snippets", "van toan ham snippets", "van toan phan 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 ("van toan hat snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( van toan hat snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("van toan hat snippets"))) or ("locating bug core snippets"))*.