Perhaps you should try some spelling variations:
minh thong » minh thuong, minh tuong, minh thang
quang uan » quang tuan, quang ban, quang tran
hieu suat » hieu luat, hieu qua
hien soat » thien hoat, kiem soat, bien soan
van hieu » cao hieu
quan doi » quan tri, quan li
doi hien » doi dien, doi bien, doi kien
tinh » trinh, dinh, kinh
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh ((quang uan) or (quan luan)) van hieu suat ) or ( minh thong quan doi hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh ((quang uan) OR (quan luan)) van hieu suat ) OR ( minh thong quan doi hien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh ((quang uan) or (quan luan)) van hieu suat ) or ( minh thong quan doi hien soat ))*.