Perhaps you should try some spelling variations:
trung doanh » trong doanh, dung doanh, trung anh
trung thanh » truong thanh
nhung cong » dung cong, thong cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
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 - thanh ((trung doanh) OR (trung thanh)) ((nhung cong) or (hang cong)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh ((trung doanh) OR (trung thanh)) ((nhung cong) OR (hang cong)) tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh ((trung doanh) OR (trung thanh)) ((nhung cong) or (hang cong)) tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh ((trung doanh) OR (trung thanh)) ((nhung cong) or (hang cong)) tinh toan cau*.