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
vi hieu » vi dieu, va hieu, vo hieu
luan va » luat 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 ((luan van) OR (luan va)) kiem soat\"))".
• Removing quotes may allow a broader search: (( tinh duong qua vi hieu soat ) or ( tinh khong ((luan van) or (luan va)) kiem soat )).