Perhaps you should try some spelling variations:
trien soat » trien hoat, trien san, thien hoat
dinh quan » dinh quang, dinh xuan, dinh duan
hieu soat » hieu suat, hieu hoat, hieu luat
va trien » va truyen, va thiet, va tuyen
van luan » van quan, van tuan, von luan
van hieu » cao hieu
luan va » luat va
can van » cac van, can ban, tan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( dinh quan luan va trien soat ) or ( can van luan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dinh quan luan va trien soat ) OR ( can van luan van hieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( dinh quan luan va trien soat ) or ( can van luan van hieu soat ))*.