Advanced Method 1:
Do a separate search for each term or phrase and combine searches using History

Control your search to a greater degree by using the Entrez features Limits and History.

I'd like to retrieve human nucleotide sequences associated with colon cancer.

Demo:  Enter each term or phrase from your query as a separate search. Use the Limits page to select the appropriate search field in each case. Then use History to combine the searches. Step 1: search Entrez CoreNucleotide for colon cancer select Limits option select Title Word as search field Press Go Step 2: Clear search box enter human as search term select Limits option select Organism as search field Press Go Step 3: select History option enter #1 AND #2 in the search box uncheck the Limits option (Your actual search numbers might vary from those in the example. Also, note that Boolean operators must be in upper case. The OR and NOT operators are also available, and parentheses can be used to nest the search.) Press Go Questions: How many hits do you have compared to the Basic search?