Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"dinh duan cau snippets" » "dinh xuan cau snippets", "dinh duong cau snippets", "dinh quang cau snippets", "dinh quan cau snippets", "dinh dan ca snippets", "dinh toan cau 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java core snippets\") OR (\"dinh duan cau snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java core snippets ) OR ( dinh duan cau snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") OR ("dinh duan cau snippets"))) OR ("locating bug code snippets"))*.