Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trang tin » trong tin, trang trinh, trang kien
trung tin » trung tinh, trong tin, truong tinh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap

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 ((trang tin) OR (trung tin)) dung cong tan ((than cau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh ((trang tin) OR (trung tin)) dung cong tan ((than cau) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh ((trang tin) OR (trung tin)) dung cong tan ((than cau) or (phan tu))*.