Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
cong thanh » dong thanh, cong trinh, cong tan
trung cua » truong cua, trung tuan, trung cap
bang cong » dang cong, bang song, hang cong
cua bang » chua bang, cua ban, cua dang
san cau » ban cau, can cau, ran cau
van cau » van dau, van hau, van chat

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

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