Perhaps you should try some spelling variations:
chiet tach » chieu sach
quang dung » quang trung, ung dung, cuong dung
hoc chiet » hoc thiet, hoc nhiet, hoc hien
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
dung cong » dung trong
cong ban » cong bang, cong san, cong tan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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: hoc chiet tach - ((hanh tran) OR (hanh tram)) quang dung cong ban ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - ((hanh tran) or (hanh tram)) quang dung cong ban ((toan cau) OR (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - ((hanh tran) or (hanh tram)) quang dung cong ban ((toan cau) OR (toan cao))*.