Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
chau tinh » cuu tinh, ha tinh, cua tinh
trinh cuu » trinh cau, trinh cua, trinh chu
cuu nang » chuc nang, cam nang, cuu van
tap toan » tap doan, tap quan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu xanh) or (chau tinh)) - hanh trinh cuu nang song ((tap toan) or (bai toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chau tinh)) - hanh trinh cuu nang song ((tap toan) OR (bai toan)) cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chau tinh)) - hanh trinh cuu nang song ((tap toan) or (bai toan)) cao*.