Perhaps you should try some spelling variations:
trinh duong » trinh dung, trinh phuong, dinh duong
duong quan » duong quang, duong qua, luong quan
kiem soat » kiem toan
hieu hoat » thien hoat, hieu luat, tieu hoa
hieu suat » hieu luat, hieu qua
quan van » luan van, quan va, quan luan
hieu hoa » tieu hoa, dieu hoa, hiep hoa

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

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