Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"tac trong che snippets" » "cay trong che snippets", "hoc trong che snippets", "tac trong cho snippets", "tac trong chien snippets", "tac trong cham 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 ("tac trong che snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( tac trong che snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("tac trong che snippets"))) or ("locating bug code snippets"))*.