Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"hoc giai php snippets" » "hoc giao php snippets", "hoc dai php snippets", "so giai php snippets", "hoc giai phap snippets", "hoc xgiai phap snippets", "hoc giai phau 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 ("hoc giai php snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( hoc giai php snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("hoc giai php snippets"))) or ("locating bug code snippets"))*.