Perhaps you should try some spelling variations:
tinh khong » tinh huong, benh khong, tinh hung
tinh khang » trinh khung, tinh quang, tinh thanh
hieu soat » hieu suat, hieu hoat, hieu luat
tien soat » trien hoat, thien hoat, kiem soat
tin quan » tinh quang, trinh quan, lien quan
van tien » toan tien, van hieu, van tuan
luan va » luat va
va hieu » van hieu, va dieu, va hien

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: (( tin quan luan va hieu soat ) OR ( ((tinh khong) OR (tinh khang)) luan van tien soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin quan luan va hieu soat ) or ( ((tinh khong) OR (tinh khang)) luan van tien soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tin quan luan va hieu soat ) or ( ((tinh khong) OR (tinh khang)) luan van tien soat ))*.