Perhaps you should try some spelling variations:
quang uan » quang tuan, quang ban, quang tran
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
dung tan » dung toan, duong tan, dung tai
tan van » tran van, tang van, luan van
ky toan » ke toan, ly toan, huy toan
uan cao » juan cao, quang cao, nang cao

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 tan van ky toan ) or ( tinh quang uan cao ((hieu soat) or (hieu suat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung tan van ky toan ) OR ( tinh quang uan cao ((hieu soat) OR (hieu suat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung tan van ky toan ) or ( tinh quang uan cao ((hieu soat) or (hieu suat)) ))*.