Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
minh thong » minh thuong, minh tuong, minh thang
thong dung » thong cong, thong thuong
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
dung van » duong van, dung va, dang van
quan van » luan van, quan va, quan luan
van hien » van hieu, van tien
hien hoa » hien khoa, dien hoa, tien hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( minh thong dung van ((hieu soat) OR (hieu luat)) ) OR ( trinh thong quan van hien hoa ))~.
• Adding a wildcard symbol may retrieve word variants: (( minh thong dung van ((hieu soat) or (hieu luat)) ) or ( trinh thong quan van hien hoa ))*.