Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh hoi thuc snippets" » "trinh hoa thuc snippets", "trinh do thuc snippets", "trinh han thuc snippets", "trinh choi thuc snippets", "trinh hoc thuc snippets", "trinh hoi chuc 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 ("trinh hoi thuc snippets"))) or ("locating bug core snippets"))~.
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