Perhaps you should try some spelling variations:
trinh thuong » trinh phuong, trinh huong, trinh truong
dung quang » dang quang, dung quan, luong quang
quang van » quang ban, quan van, quang uan
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
van hieu » cao hieu
luan va » luan van
luat va » xuat va, luat ve, suat va
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 quang van hieu soat ) or ( trinh thuong ((luan va) or (luat va)) kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quang van hieu soat ) OR ( trinh thuong ((luan va) OR (luat va)) kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung quang van hieu soat ) or ( trinh thuong ((luan va) or (luat va)) kiem soat ))*.