Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
trung doan » trang doan, trong doanh, truong toan
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, hoang manh
toan cau » toan ban, toan tap, toan tai
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 doan phuong ((cong manh) OR (cong thanh)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trung doan phuong ((cong manh) OR (cong thanh)) ((toan cau) OR (toan cao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh trung doan phuong ((cong manh) OR (cong thanh)) ((toan cau) or (toan cao))*".