Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"chan toan cua snippets" » "chan doan cua snippets", "thanh toan cua snippets", "khanh toan cua snippets", "chan than cua snippets", "chan tan cua snippets", "chan doanh cua snippets"
"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 ("chan toan cua snippets"))) or ("locating bug code snippets"))~.
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