i've tested this query and seems its working if you please confirm
var str_condition = string.Format("+({0}:{1})", "title", "\"smapleTitle\"").ToLower();
str_condition += string.Format("+({0}:{1})", "Body", "\"SampleBosy\"").ToLower();
var condition = new SearchCondition(str_condition, SearchModeEnum.ExactPhrase, SearchOptionsEnum.NoneSearch);
searchText = SearchSyntaxHelper.CombineSearchCondition(searchText, condition);
if all ok, I need also to filter articles with its parent page types, how can I do this
have the following hierarchy on the content tree -
Main Category -> Sub Category -> Article
how to add a condition to the search for main and subcategories
like filter only articles below one or more main category or one or more subcategories