Perhaps you should try some spelling variations:
trinh dang » trinh dung, trinh dan, trinh bang
dang quang » dung quang, nang quan, dang hung
luong quan » duong qua
quang cao » nang cao, quang nam
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
va kiem » van kien

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

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