Perhaps you should try some spelling variations:
"can anh khoa luan chi phi gian thanh" » "can anh khoa luan chi phi gia thanh", "can anh khoa luan chi phi ban thanh", "can anh khoa luan chi phi van thanh", "can doanh khoa luan chi phi gian thanh", "can hang khoa luan chi phi gian thanh", "can anh khoa luan chi thoi gian thanh", "can anh khoa luan chi thi giang thanh", "lan anh khoa luan chi phi gian thanh", "cao anh khoa luan chi phi gian thanh", "ban anh khoa luan chi phi gian thanh", "can anh khoa quan chi phi gian thanh", "can anh khoa lan chi phi gian thanh"
"van anh khoa luan chi phi gian thanh" » "van anh khoa luan chi phi gia thanh", "van anh khoa luan chi phi ban thanh", "van anh khoa luan chi phi van thanh", "van doanh khoa luan chi phi gian thanh", "van hang khoa luan chi phi gian thanh", "van anh khoa luan chi thoi gian thanh", "van anh khoa luan chi thi giang thanh", "van thanh khoa luan chi phi gian thanh", "tuan anh khoa luan chi phi gian thanh", "van minh khoa luan chi phi gian thanh", "van anh khoa quan chi phi gian thanh", "van anh khoa lan chi phi gian thanh"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("can anh khoa luan chi phi gian thanh") OR ("van anh khoa luan chi phi gian thanh"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"can anh khoa luan chi phi gian thanh\") OR (\"van anh khoa luan chi phi gian thanh\"))".
• Removing quotes may allow a broader search: (( can anh khoa luan chi phi gian thanh ) OR ( van anh khoa luan chi phi gian thanh )).
• Adding a wildcard symbol may retrieve word variants: (("can anh khoa luan chi phi gian thanh") OR ("van anh khoa luan chi phi gian thanh"))*.