Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, theo sach
khong cang » thong cong, hong bang, khong dung
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
chinh cau » chinh chau, chinh ca, chinh can
cang dan » cong dan, tang dan, canh dan
phan cau » phan dau, phan cac, phan tu

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 (hieu cach)) - thanh trung cua khong cang dan ((phan cau) or (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh trung cua khong cang dan ((phan cau) OR (chinh cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - thanh trung cua khong cang dan ((phan cau) or (chinh cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - thanh trung cua khong cang dan ((phan cau) or (chinh cau))*.