Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: hoc ((hien xanh) or (chieu sach)) - canh tranh cua hang cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu sach)) - canh tranh cua hang cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sach)) - canh tranh cua hang cong tap toan cao*.