Perhaps you should try some spelling variations:
tieng duong » tieng muong, tieng chuong, tien luong
quang hoan » quang hoang, quang doan, quang toan
tinh khong » tinh khang, tinh huong, benh khong
khong quan » thong quan, hong quan, thong quang
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
qua doan » quan doan, qua dan, quang doan
quan ha » quan he
ha kiem » hoa kiem, va kiem, phan kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tieng duong ((qua doan) or (quang hoan)) hieu soat ) or ( tinh khong quan ha kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tieng duong ((qua doan) OR (quang hoan)) hieu soat ) OR ( tinh khong quan ha kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tieng duong ((qua doan) or (quang hoan)) hieu soat ) or ( tinh khong quan ha kiem soat ))*.