Perhaps you should try some spelling variations:
"va phuong cham snippets" » "va phuong phap snippets", "va phuong thao snippets", "va thuong cham snippets", "cac phuong cham snippets"
"using a java snippets" » "using _ 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 phuong cham snippets") or ("using a java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("va phuong cham snippets") OR ("using a java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( va phuong cham snippets ) or ( using a java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("va phuong cham snippets") or ("using a java snippets"))) or ("locating bug code snippets"))*.