Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
cong thanh » dong thanh, cong tan, truong thanh
tuan dang » tran dang, tuan bang, tuan dung
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo yeu tinh - hanh trung tuan dang ((cong thanh) OR (cong trinh)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo yeu tinh - hanh trung tuan dang ((cong thanh) OR (cong trinh)) toan cau*.