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To find a combination of words in a phrase, embed them in quotes, for example "genetic engineering".
To find a combination of words, not necessarily in sequence or together (Boolean AND), prefix the words or quoted phrases with a '+' sign. For example, +biosphere +"climate change" will find documents that include both the word biosphere and the phrase climate change.
To find any one of several words (Boolean OR), enter the words without quotes. For example, radio x-ray quasar will find any or all of the words wherever they occur. Avoid using prepositions and indefinite or definite articles in this sort of search or you'll be swamped with unhelpful results. (For example, using the words science in the news without quotes will produce a lot a unhelpful references to pages with 'in' and 'the'.)
To exclude words or phrases (Boolean NOT), prefix them with a '-' sign. For example, -administration will exclude pages that include the word administration.