Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh than vao snippets" » "trinh thanh vao snippets", "trinh han vao snippets", "trinh toan vao snippets", "trinh than va snippets", "trinh than vo snippets", "trinh than sao 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 than vao snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trinh than vao snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( trinh than vao snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trinh than vao snippets"))) or ("locating bug core snippets"))*.