Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"tao van duc snippets" » "thao van duc snippets", "tao va duc snippets", "dao van duc snippets", "tao van duy snippets", "tao van du snippets", "tao tran duc 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 ("tao van duc snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( tao van duc snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("tao van duc snippets"))) or ("locating bug code snippets"))*.