Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"de tang hoc snippets" » "de nang hoc snippets", "de tang ho snippets", "de bang hoc snippets", "le tang hoc snippets", "de dang hoc snippets", "do tang hoc 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 ("de tang hoc snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( de tang hoc snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("de tang hoc snippets"))) or ("locating bug code snippets"))*.