Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, hieu luat
trinh san » trinh han, trinh quan, trinh toan
kiem soat » kiem toan
quan van » luan van, quan va, quan luan
van hieu » cao hieu
quang ma » xquang ma, quang va, quang manh
ma kiem » may kiem, va kiem, ma kem

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dung quan van hieu soat ) or ( ((trinh san) or (tinh toan)) quang ma kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quan van hieu soat ) OR ( ((trinh san) OR (tinh toan)) quang ma kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quan van hieu soat ) or ( ((trinh san) or (tinh toan)) quang ma kiem soat ))*.