Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"trinh hoi thuc slippers" » "trinh hoa thuc slippers", "trinh do thuc slippers", "trinh han thuc slippers", "trinh choi thuc slippers", "trinh hoc thuc slippers", "trinh hoi chuc slippers", "trinh hoi thuc slippery", "trinh hoi thuc 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 ("trinh hoi thuc slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trinh hoi thuc slippers"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trinh hoi thuc slippers"))) or ("locating bug code snippets"))*.