Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"len cong than snippets" » "len cong thanh snippets", "len cong thang snippets", "len cong tan snippets", "den cong than snippets", "le cong than snippets", "len con than 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 ("len cong than snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("len cong than snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( len cong than snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("len cong than snippets"))) or ("locating bug core snippets"))*.