Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"quan doc he snippets" » "quan doi he snippets", "quan dac he snippets", "quan doan he snippets", "quan hoc he snippets", "quan do he snippets", "quan doc hieu 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 ("quan doc he snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("quan doc he snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( quan doc he snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("quan doc he snippets"))) or ("locating bug code snippets"))*.