Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
nghe thong » he thong
thong cong » trong cong, tong cong, thong thong
chau tinh » cuu tinh, ha tinh, cua tinh
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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 (chau tinh)) - ((thanh trung) OR (thanh tung)) nghe thong cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chau tinh)) - ((thanh trung) OR (thanh tung)) nghe thong cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chau tinh)) - ((thanh trung) OR (thanh tung)) nghe thong cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chau tinh)) - ((thanh trung) OR (thanh tung)) nghe thong cong tan toan ban*.