Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"danh phan trac slippers" » "doanh phan trac slippers", "danh nhan trac slippers", "danh phap trac slippers", "danh phan tap slippers", "danh phan cac slippers", "danh phan tan slippers", "danh phan trac slippery", "danh phan trac grippers"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs 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 ("danh phan trac slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("danh phan trac slippers"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("danh phan trac slippers"))) or ("locating bug code snippets"))*.