Perhaps you should try some spelling variations:
"van chuong cac snippets" » "van cuong cac snippets", "van phuong cach snippets", "van luong cac snippets", "van phong cac snippets", "van duong cac snippets", "van hung cac snippets"
"using raw java snippets" » "using real java snippets", "using a java snippets", "using low 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using raw java snippets\") OR (\"van chuong cac snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using raw java snippets ) OR ( van chuong cac snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using raw java snippets") OR ("van chuong cac snippets"))) OR ("locating bug code snippets"))*.