Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"trinh cho anh slippers" » "trinh chao anh slippers", "trinh co anh slippers", "trinh chat anh slippers", "trinh cao anh slippers", "trinh ho anh slippers", "trinh chi anh slippers", "trinh cho anh slippery", "trinh cho anh 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 cho anh 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 cho anh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( trinh cho anh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trinh cho anh slippers"))) or ("locating bug code snippets"))*.