Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"yang anh son snippets" » "yang danh son snippets", "bang anh son snippets", "hoang anh son snippets", "yang anh dong snippets", "yang tinh son snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs 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 core snippets") OR ("yang anh son snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( yang anh son snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("yang anh son snippets"))) or ("locating bug code snippets"))*.