Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"cac duoc hoi snippets" » "cac nuoc hoi snippets", "cac cuoc hoi snippets", "cac quoc hoi snippets", "cac duoc hoc snippets", "cac duoc si 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 ("cac duoc hoi snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( cac duoc hoi snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("cac duoc hoi snippets"))) or ("locating bug code snippets"))*.