Perhaps you should try some spelling variations:
"viet trinh toan snippets" » "viet trinh code snippets", "viet trung toan snippets", "viet thanh toan snippets", "viet trong toan snippets", "viet tinh toan snippets", "viet trinh han snippets"
"locating bug core snippets" » "locating bug code snippets"
"using a java snippets" » "using _ java snippets"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet trinh toan snippets") OR ("using a java snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( viet trinh toan snippets ) or ( using a java snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("viet trinh toan snippets") or ("using a java snippets"))) or ("locating bug core snippets"))*.