Perhaps you should try some spelling variations:
tinh thong » tinh thuong, trinh thong, tinh khong
quang van » quang ban, quan van, quang uan
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
van hieu » cao hieu
quan khu » quan he, quan ha, quan su
khu kiem » thu kiem, khuan kiem, phtu kiem

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) or (tinh quang)) quang van hieu soat ) or ( tinh thong quan khu kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tin dung) OR (tinh quang)) quang van hieu soat ) OR ( tinh thong quan khu kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( ((tin dung) or (tinh quang)) quang van hieu soat ) or ( tinh thong quan khu kiem soat ))*.