Perhaps you should try some spelling variations:
thien toan » thien thanh, thien van, thien tai
quang tuan » quang thanh, quan luan, quang cua
kiem soat » kiem toan
hien soan » bien soan, dien toan, lien son
tuan va » toan va, luan va, quan va
va kiem » van kien
tinh » dinh, minh, kinh
luan » quan, lan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tuan va kiem soat ) OR ( trinh dung luan van ((hien soan) OR (thien toan)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh quang tuan va kiem soat ) or ( trinh dung luan van ((hien soan) OR (thien toan)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh quang tuan va kiem soat ) or ( trinh dung luan van ((hien soan) OR (thien toan)) ))*.