Perhaps you should try some spelling variations:
hanh tranh » hanh trang, lanh tranh, nhanh thanh
hanh trinh » hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
cua nang » chua nang, cua dang, cua hang
song tap » tong tap, song tam, cuong tap
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 - ((((hanh tranh) or (hanh trinh))) or (canh tranh)) cua nang song tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((((hanh tranh) OR (hanh trinh))) OR (canh tranh)) cua nang song tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((((hanh tranh) or (hanh trinh))) or (canh tranh)) cua nang song tap toan cao*.