Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
toan hang » toan thang, toan hanh, toan mang
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan

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 hang cong tan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - ((canh trinh) OR (canh tinh)) toan hang cong tan phan tu.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - ((canh trinh) or (canh tinh)) toan hang cong tan phan tu*.