Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
canh trinh » canh tranh, hanh trinh, anh trinh
cong thanh » dong thanh, cong trinh, cong tan
thanh phan » thanh pho, thanh san, thanh toan
canh tinh » hanh tinh, manh tinh, canh tranh
toan dang » tran dang, toan mang, toan tang
dang cong » dung cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - ((canh trinh) or (canh tinh)) toan dang cong thanh phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - ((canh trinh) OR (canh tinh)) toan dang cong thanh phan tu.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - ((canh trinh) or (canh tinh)) toan dang cong thanh phan tu*.