Perhaps you should try some spelling variations:
"sung va trinh snippets" » "sung van trinh snippets", "sung va tinh snippets", "sung lap trinh snippets", "sung vao trinh snippets", "vung va trinh snippets", "song va trinh snippets", "sung va trinh slippers"
"dung va java snippets" » "dung java java snippets", "dung va java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("sung va trinh snippets") or ("dung va java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sung va trinh snippets") OR ("dung va java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sung va trinh snippets ) or ( dung va java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sung va trinh snippets") or ("dung va java snippets"))) or ("locating bug code snippets"))*.