Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
phuong dan » phuong danh, phuong doan, huong dan
cua thong » cua thuong, cua khong, suat thong
cua tong » cua cong, cua dong, cua nong
dan phan » doan phan, dan chan, van phan
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 (thien hach)) - thanh trung ((cua thong) OR (cua tong)) phuong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh trung ((cua thong) OR (cua tong)) phuong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (thien hach)) - thanh trung ((cua thong) OR (cua tong)) phuong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - thanh trung ((cua thong) OR (cua tong)) phuong dan phan cau*.