Perhaps you should try some spelling variations:
tin luong » tien luong, tin huong, tin tuong
dung quan » dung quang, dung luan, luong quan
hieu luat » hieu qua
hien tra » hien trau, hien ra, hien trang
quan van » luan van, quan va, quan luan
van hieu » cao hieu
thi lan » thi hanh, thi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin luong ((thi lan) OR (thi lien)) hien tra ) or ( trinh dung quan van hieu luat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin luong ((thi lan) OR (thi lien)) hien tra ) OR ( trinh dung quan van hieu luat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin luong ((thi lan) OR (thi lien)) hien tra ) or ( trinh dung quan van hieu luat ))*".