Perhaps you should try some spelling variations:
trinh han » trinh quan
hieu soat » hieu suat, hieu hoat, hieu luat
dung lang » dung dang, dung land, dung quang
dung nang » dun nang, dung dang, dung quang
tien soat » trien hoat, thien hoat, kiem soat
han hang » hang hang, han chang, ban hang
van tien » toan tien, van hieu, van tuan
va hieu » van hieu, va dieu, va hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh han hang va hieu soat ) or ( tin ((dung lang) or (dung nang)) van tien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh han hang va hieu soat ) OR ( tin ((dung lang) OR (dung nang)) van tien soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh han hang va hieu soat ) or ( tin ((dung lang) or (dung nang)) van tien soat ))*.