Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh kham cau snippets" » "trinh cham cau snippets", "trinh khai cau snippets", "trinh han cau snippets", "trinh kham chua snippets", "trinh cham cuu snippets", "trinh kham da 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 kham cau 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 kham cau snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( trinh kham cau snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trinh kham cau snippets"))) or ("locating bug core snippets"))*.