Perhaps you should try some spelling variations:
"dung nghien o snippets" » "duong nghien o snippets", "dung chien o snippets", "dong nghiep o snippets", "dung nghiep o snippets", "dung nghiep so snippets", "dung nghiep co snippets"
"using java code snippets" » "using data code snippets", "using java core snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs 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 ("dung nghien o snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( dung nghien o snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("dung nghien o snippets"))) or ("locating bug code snippets"))*.