Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
canh trinh » canh tranh, hanh trinh, anh trinh
thang cong » thanh cong, thang long, thong cong
lang thang » cang thang, dang thanh, hung thang
canh tinh » hanh tinh, manh tinh, canh tranh
cong lang » cong vang, cong luong, cong quang
thang cap » thong cap, than cap, trung cap
te thang » le thang, te than, ke thang

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)) te thang cong lang thang cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - ((canh trinh) OR (canh tinh)) te thang cong lang thang cap*.