Perhaps you should try some spelling variations:
trien hoat » tien hoa
dang quang » dung quang, nang quan, dang hung
tinh quan » tinh quang, trinh quan, sinh quan
hieu soat » hieu suat, hieu hoat, hieu luat
tinh dang » tinh dung, binh dang, tinh sang
quang van » quang ban, quan van, quang uan
van trien » van tien, va trien, van tren
tin quan » tinh quang, trinh quan, lien quan
van hieu » cao hieu
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((tinh quan) OR (tin quan)) luan van hieu soat ) or ( tinh dang quang van trien hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh quan) OR (tin quan)) luan van hieu soat ) OR ( tinh dang quang van trien hoat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tinh quan) OR (tin quan)) luan van hieu soat ) or ( tinh dang quang van trien hoat ))*".