Perhaps you should try some spelling variations:
"trien chi hoan van kinh doanh" » "trien thi hoan van kinh doanh", "trien khai hoan van kinh doanh", "trieu thi hoan van kinh doanh", "trien choi hoan van kinh doanh", "trien chi hoa van kinh doanh", "trien chi hoang van kinh doanh", "trien chi doan van kinh doanh", "trien chi hoan van minh doanh", "trien chi hoan van dinh doanh", "trien chi hoan van binh doanh", "trien chi khoan van kinh doanh"
"trien chi hoan va kinh doanh" » "trien thi hoan va kinh doanh", "trien khai hoan va kinh doanh", "trieu thi hoan va kinh doanh", "trien choi hoan va kinh doanh", "trien chi hoa va kinh doanh", "trien chi khoan va kinh doanh", "trien chi hoang va kinh doanh", "trien chi doan va kinh doanh", "trien chi hoan va tinh doanh", "trien chi hoan qua kinh doanh"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("trien chi hoan van kinh doanh") OR ("trien chi hoan va kinh doanh"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"trien chi hoan van kinh doanh\") OR (\"trien chi hoan va kinh doanh\"))".
• Removing quotes may allow a broader search: (( trien chi hoan van kinh doanh ) OR ( trien chi hoan va kinh doanh )).
• Adding a wildcard symbol may retrieve word variants: (("trien chi hoan van kinh doanh") OR ("trien chi hoan va kinh doanh"))*.