Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"thi luan cac snippets" » "thi lan cac snippets", "thi xuan cac snippets", "thi loan cac snippets", "thi luan dac snippets", "thi luan tac snippets", "thi luat cac snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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 ("thi luan cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("thi luan cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( thi luan cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("thi luan cac snippets"))) or ("locating bug code snippets"))*.