Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dong son toan snippets" » "dong von toan snippets", "dong san toan snippets", "hoang son toan snippets", "dong mon toan snippets", "dong so toan snippets", "dong son thanh 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 ("dong son toan snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( dong son toan snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("dong son toan snippets"))) or ("locating bug core snippets"))*.