Perhaps you should try some spelling variations:
"van duong cong snippets" » "van duong code snippets", "van dung cong snippets", "van luong cong snippets", "van duong trong snippets", "van dong cong snippets", "van phong 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("van duong cong snippets") or ("using java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van duong cong snippets") OR ("using java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van duong cong snippets ) or ( using java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duong cong snippets") or ("using java java snippets"))) or ("locating bug core snippets"))*.