Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"tung doan dieu snippets" » "tung dan dieu snippets", "dung doanh dieu snippets", "quang doan dieu snippets", "tung nhan dieu snippets", "tung dang dieu snippets", "tung toan dien snippets"
"locating bug core snippets" » "locating bug code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java code snippets") or ("tung doan dieu snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("tung doan dieu snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( tung doan dieu snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("tung doan dieu snippets"))) or ("locating bug core snippets"))*.