Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((((chieu sach) or (chiet tach))) or (chieu tinh)) - canh tranh cua nhung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((chieu sach) OR (chiet tach))) OR (chieu tinh)) - canh tranh cua nhung cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((((chieu sach) or (chiet tach))) or (chieu tinh)) - canh tranh cua nhung cong tap toan cau*.