Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
di cuu » di cau, di cua, dinh cuu
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((o hoi) or (co hoi)). hieu ve cac tu va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((o hoi) OR (co hoi)). hieu ve cac tu va hanh di cuu tre*.