Perhaps you should try some spelling variations:
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
hien tach » thien hach, vien bach, hien hanh
trang cua » tranh cua, tang cua, trung cua
tong cong » trong cong, cong cong, dung cong
cong dang » cong dong, cong dan, cong dung
dang tran » dang thanh, quang tran, hoang tran
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien tach) OR (chiet tach)) - hanh ((trang cua) or (trung tuan)) tong cong dang tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tach) OR (chiet tach)) - hanh ((trang cua) OR (trung tuan)) tong cong dang tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) OR (chiet tach)) - hanh ((trang cua) or (trung tuan)) tong cong dang tran cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) OR (chiet tach)) - hanh ((trang cua) or (trung tuan)) tong cong dang tran cau*.