By Yadarisa Shabong and Alexander Marrow (Reuters) -Unilever's third-quarter underlying sales growth narrowly topped market expectations on Thursday, driven by double-digit sales growth in hair care brands including Dove, K18 and Nutrafol, particularly in North America. The beat underscores how the owner of brands from Hellmann's mayonnaise to Domestos disinfectant is looking to push into higher-margin premium products in beauty and personal care. That's key to a turnaround under new CEO Fernando Fernandez who took the helm of the consumer goods giant in March. He is streamlining the business, cutting costs, and exploring sales of non-core brands to bolster margins amid weak consumer sentiment and economic uncertainty. Since Fernandez's appointment, Unilever's shares, which traded around 1

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