Perhaps you should try some spelling variations:
dong doanh » dung doanh, trong doanh, doanh doanh
doanh hieu » doanh sieu, doan dieu, dong hieu
quang quan » quang tuan, quang uan, quan quan
trinh van » trinh han, trinh quan, trinh toan
hieu soat » hieu suat, hieu hoat, hieu luat
luan hieu » luan tieu, luan dieu, luan thiet
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh van dong doanh hieu soat ) or ( tinh quang quan luan hieu va ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh van dong doanh hieu soat ) OR ( tinh quang quan luan hieu va ))*.