Perhaps you should try some spelling variations:
"viet truong cao snippets" » "viet trung cao snippets", "vien truong cao snippets", "viet trong cao snippets", "viet truong dai 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: (((("using a java snippets") or ("viet truong cao snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a java snippets") OR ("viet truong cao snippets"))) OR ("locating bug code snippets"))*.
• Removing quotes may allow a broader search: (((( using a java snippets ) or ( viet truong cao snippets ))) or ( locating bug code snippets ))*.