Perhaps you should try some spelling variations:
trinh dang » trinh dung, trinh dan, trinh bang
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
dang cong » dung cong
cong tuan » cong tan, cong luan, cong thanh
tuan kien » tuan kiet, tuan tien, xuan kien
kien soat » kiem soat, bien soan, kien hoa
quan van » luan van, quan va, quan luan
tin » tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung quan van ((hieu soat) OR (hieu luat)) ) or ( trinh dang cong tuan kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quan van ((hieu soat) OR (hieu luat)) ) OR ( trinh dang cong tuan kien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung quan van ((hieu soat) OR (hieu luat)) ) or ( trinh dang cong tuan kien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung quan van ((hieu soat) OR (hieu luat)) ) or ( trinh dang cong tuan kien soat ))*.