Perhaps you should try some spelling variations:
trinh phuong » trinh duong, trinh dung, trinh cong
phuong thao » phuong phap, phuong thuc
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
thao van » thai van, hao van, thanh van
van hieu » cao hieu
tran van » luan van
tranh va » tranh van, trang va, trinh va

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

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