Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hien xanh » hien hanh, hien nhanh, chieu xanh
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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 trang ((cua dung) or (cua dong)) cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh trang ((cua dung) OR (cua dong)) cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trang ((cua dung) or (cua dong)) cong tap toan ban*.