Perhaps you should try some spelling variations:
"va trung open snippets" » "va trung kien snippets", "va dung open snippets", "va trung hien snippets", "ba trung open snippets", "ha trung open snippets", "va thuong open snippets"
"using java java snippets" » "using data java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

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