Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
vinh toan » hinh toan, minh toan, vinh tran
chao chu » cho chu, cua chu, cao cho
trinh va » trinh van, trinh vat, trinh ve
va dung » van dung, va duong, vat dung

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: ((chao chu) OR (hoc thieu)) sang - hanh trinh va dung cong ((vinh toan) OR (tinh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((chao chu) or (hoc thieu)) sang - hanh trinh va dung cong ((vinh toan) OR (tinh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((chao chu) or (hoc thieu)) sang - hanh trinh va dung cong ((vinh toan) OR (tinh toan)) cau*.