Perhaps you should try some spelling variations:
trinh duong » trinh dung, trinh phuong, dinh duong
duong quan » duong quang, duong qua, luong quan
thien hoat » trien hoat, thien thuat, tien hoa
hieu soat » hieu suat, hieu luat, hieu so
kiem soat » kiem toan
hieu hoat » hieu hoa, hieu luat, hieu suat

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 luan ((((hieu soat) OR (kiem soat))) or (((hieu hoat) or (thien hoat))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: trinh duong quan luan ((((hieu soat) OR (kiem soat))) OR (((hieu hoat) OR (thien hoat)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "trinh duong quan luan ((((hieu soat) OR (kiem soat))) or (((hieu hoat) or (thien hoat))))".
• Adding a wildcard symbol may retrieve word variants: trinh duong quan luan ((((hieu soat) OR (kiem soat))) or (((hieu hoat) or (thien hoat))))*.