Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"van han viet snippets" » "van san viet snippets", "van van viet snippets", "van dan viet snippets", "van hanh viet snippets", "van phan viet snippets", "van nhan viet snippets"
"locating bug core snippets" » "locating bug code 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: (((("using java code snippets") OR ("van han viet snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( van han viet snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("van han viet snippets"))) or ("locating bug core snippets"))*.