Search string may contain the logical operators AND and OR and the operands () and "". AND searches for both words or phrases, while OR searches for one or the other. If the search string uses AND and OR at the same time, the AND operation takes priority, unless you enclose the OR operation in parentheses, as in (A or B) and C. To find an exact phrase, such as "absolute distribution", enclose the phrase in quotes.
Please refer to the following examples:

• Search for Zambia to find all series that contain Zambia.
• Search for Zambia OR Goods to find all series that contain either Zambia or Goods indicators.
• Search for Zambia AND Goods to find all series that contain both Zambia and Goods indicators.
• Search for Zambia XOR Goods to find all series that contain either "Zambia" of "Goods" indicators.
• Search for (Zambia OR Goods) "spark-ignition engine" to find all series that contain either Zambia or Goods indicators or the phrase "spark-ignition engine".