Perhaps you should try some spelling variations:
tinh phuong » trinh phuong, tinh huong, dinh phuong
phuong lan » phuong la, thuong lan, phuong linh
hieu soat » hieu suat, hieu hoat, hieu luat
quang tan » quang tuan, quang tran, quang toan
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien
lan van » luan van, lang van, san van
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh phuong lan van hieu soat ) or ( tinh quang tan van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh phuong lan van hieu soat ) OR ( tinh quang tan van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh phuong lan van hieu soat ) or ( tinh quang tan van kiem soat ))*.