Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"lan van hang snippets" » "lan van khang snippets", "lan van hoang snippets", "lan van thang snippets", "luan van hang snippets", "lang van hang snippets", "tan van hang snippets"
"locating bug core snippets" » "locating bug 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 code snippets") or ("lan van hang snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("lan van hang snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( lan van hang snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("lan van hang snippets"))) or ("locating bug core snippets"))*.