Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trinh » canh tranh, hanh chinh
cua thuong » cua truong, cua phuong, ca thuong
cua khong » hua khong, cua phuong, cua cong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - ((thanh trung) or (hanh trinh)) ((cua khong) OR (cua thuong)) cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - ((thanh trung) OR (hanh trinh)) ((cua khong) OR (cua thuong)) cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - ((thanh trung) or (hanh trinh)) ((cua khong) OR (cua thuong)) cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - ((thanh trung) or (hanh trinh)) ((cua khong) OR (cua thuong)) cong dan than cao*.