Perhaps you should try some spelling variations:
trung dinh » truong dinh, trung tinh, thuong dinh
trung binh » trong binh, thuong binh, tran binh
huong dong » phuong dong, chuong dong, thuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
dong tinh » dong kinh, dong tin, cong tinh
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh ((trung dinh) OR (trung binh)) huong dong tinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((trung dinh) OR (trung binh)) huong dong tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trung dinh) OR (trung binh)) huong dong tinh toan cau*.