Perhaps you should try some spelling variations:
trung quan » truong quan, trong quan, truong quang
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 quan) OR (trung tuan)) nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((trung quan) OR (trung tuan)) nhung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trung quan) OR (trung tuan)) nhung cong tac toan cau*.