Perhaps you should try some spelling variations:
"vien phan van snippets" » "viet phan van snippets", "dien phan van snippets", "vien nhan van snippets", "vien pham van snippets", "vien thanh van snippets", "vien luan van snippets", "vien phan van slippers"
"using low java snippets" » "using low java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("vien phan van snippets") or ("using low java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vien phan van snippets") OR ("using low java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vien phan van snippets ) or ( using low java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vien phan van snippets") or ("using low java snippets"))) or ("locating bug code snippets"))*.