1. A method for retrieving information from a semantic database having a plurality of semantic data in response to a query, comprising: translating, by one or more processors, each of the plurality of semantic data to a first-order logic formula constructed by one or more atomic symbols and operators; selecting, by one or more processors, a first semantic data as a hub in an offline environment from the plurality of semantic data, wherein the first semantic data is resolved with a number of semantic data based on a resolution rule, and the number of the semantic data resolved with the hub is greater than a threshold, wherein a first standard formula transformed from the translated first-order logic formula of the first semantic data is resolved with a second standard formula transformed from the translated first-order logic formula of any of the number of semantic data, and further wherein one atomic symbol of the atomic symbols exists in the first standard formula and the negation of the atomic symbol exists in the second standard formula; calculating, by one or more processors, the semantic dataset by calculating in a first level of a searching approach, a first resolvent of (1) the hub and (2) a second semantic data which directly links to the hub based on a resolution rule, and in response to the second semantic data being resolved with the hub, selecting the second semantic data as a part of the semantic data set in the offline environment; calculating, by one or more processors, the semantic dataset by calculating in a second level of the searching approach, a second resolvent of (1) the semantic data set resulted in the first level of the searching approach and (2) a third semantic data which is within a predetermined distance from the hub, and in response to the third semantic data being resolved with any semantic data of the semantic data set resulted in the first level of the searching approach, selecting the third semantic data as a part of the semantic data set in the offline environment, wherein the calculating of the semantic data set is continuously executed in a background of the semantic database until a particular calculation limit is reached; indexing, by one or more processors, the semantic data set in the offline environment; modifying, by one or more processors, the semantic database to include the indexed semantic data set in the offline environment; and retrieving, by one or more processors, information from the semantic data set in an online environment in response to the query.