Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
chau tinh » cuu tinh, ha tinh, cua tinh
thuc nang » chuc nang, thuc trang, thich nang
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 thuc 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 thuc nang song ((tap toan) OR (bai toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chau tinh)) - hanh trinh thuc nang song ((tap toan) OR (bai toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chau tinh)) - hanh trinh thuc nang song ((tap toan) OR (bai toan)) cao*.