Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
tan thanh » tran thanh, tang thanh, toan thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chinh sach)) - hanh trung tuan ((hang cong) OR (bang cong)) tan thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - hanh trung tuan ((hang cong) OR (bang cong)) tan thanh san.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chinh sach)) - hanh trung tuan ((hang cong) OR (bang cong)) tan thanh san".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chinh sach)) - hanh trung tuan ((hang cong) OR (bang cong)) tan thanh san*.