Sites: Limit the search to specific sites. If you know that there is something you need in a website, you can limit the search scope to this website to improve the query efficiency.
Restrict file types. This command is very useful when searching for professional documents and materials. For example, many professional documents are in pdf, ppt, doc and jpg formats.
Limit time (20xx...20xx), and use time statements 20xx—20xx to realize keyword search within a specific time. Subtract a keyword (minus sign-) and use "-"to exclude specific keywords.
Limiting keywords to the intitle can prevent Baidu from finding a large number of scattered content with low relevance and greatly improve the search efficiency.
Information retrieval is the main way for users to query and obtain information, and it is also the method and means to find information.
Information retrieval originated from the reference service and abstract index of the library. Information retrieval methods include common law, backtracking method and segmentation method.
Network information search
Information is an important resource in today's society, and network information search is an important information ability of contemporary people. "Network information search" is a phased achievement of the project undertaken by Beijing Chaoyang District Education Research Center. Aiming at the knowledge demand and ability training of teenagers, the author systematically introduces the knowledge and skills of network information retrieval combined with years of teaching experience at the grass-roots level.
"Network Information Search" is divided into 9 chapters, which introduces the search methods of information such as words, images and daily life step by step. "Network Information Search" focuses on the analysis of problem-solving ideas, with well-designed learning tasks and exercises. The teaching task strives to solve practical problems in order to cultivate students' comprehensive practical ability of network information retrieval.
"Network Information Search" is a supplementary book for China Children's Computer Exhibition Competition. The "Competition Link" part of each chapter has selected exhibition questions, which can also be used as teaching materials and reference books for information technology and other related courses in primary and secondary schools.
The above contents refer to Baidu Encyclopedia-Network Information Search.