Perhaps you should try some spelling variations:
"vi duong cong snippets" » "vi duong code snippets", "vi dung cong snippets", "vi luong cong snippets", "vi duong trong snippets", "va duong cong snippets", "vu duong cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java 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 java snippets") OR ("vi duong cong snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java java snippets ) or ( vi duong cong snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") or ("vi duong cong snippets"))) or ("locating bug core snippets"))*.