Perhaps you should try some spelling variations:
tinh khong » tinh khang, tinh huong, benh khong
tinh duong » trinh duong, dinh duong, binh duong
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
quan van » luan van, quan luan, quan doan
vi hieu » vi dieu, va hieu, vo hieu
quan va » quan vi, quan ha, luan va
qua vi » quan vi, cua vi, qua di

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

• If you are trying to use Boolean operators, they must be ALL CAPS: "((\"tinh duong qua vi hieu soat\") or (\"tinh khong ((quan van) OR (quan va)) kiem soat\"))".
• Removing quotes may allow a broader search: (( tinh duong qua vi hieu soat ) or ( tinh khong ((quan van) or (quan va)) kiem soat )).