Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"tang toan can snippets" » "dang toan can snippets", "tang tan can snippets", "thanh toan can snippets", "tang toan ban snippets", "tang toan cao snippets", "tang 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java core snippets") or ("tang toan can snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("tang toan can snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( tang toan can snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("tang toan can snippets"))) or ("locating bug code snippets"))*.