Perhaps you should try some spelling variations:
dang quang » dung quang, nang quan, dang hung
quang toan » quang tuan, quang tran, quang doan
trien hoat » tien hoa
tinh dung » trinh dung, tin dung, tinh quang
hieu luat » hieu qua
dinh dang » dinh dung, binh dang, dinh lang
tien soat » thien hoat, kiem soat, tien hoa
van hieu » cao hieu
luan » quan, 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 dung luan van hieu luat ) or ( dinh dang quang toan ((tien soat) OR (trien hoat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu luat ) OR ( dinh dang quang toan ((tien soat) OR (trien hoat)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van hieu luat ) or ( dinh dang quang toan ((tien soat) OR (trien hoat)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu luat ) or ( dinh dang quang toan ((tien soat) OR (trien hoat)) ))*.