In recent information technology, cloud computing is a dominant trend. Due to large number of data users and large storage of data over cloud servers, it becomes very important to ensure efficient retrieval over cloud. For effective search of cloud data security and result ranking is very necessary. Paper first, describes various search techniques briefly. After that some problems related to privacy and efficient retrieval is illustrated. Then an evaluation is made, which shows how TRSE is beneficial over other techniques. TRSE (Two Round Searchable Encryption) is a secure search scheme, which uses vector space model and homomorphic encryption.