Perhaps you should try some spelling variations:
van xanh » van anh, van hanh, van manh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
xanh di » danh di, vanh dai, xanh tai
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
5 hoi » o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((5 hoi) or (xa hoi)). hieu ve cac duc van xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((5 hoi) OR (xa hoi)). hieu ve cac duc van xanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((5 hoi) or (xa hoi)). hieu ve cac duc van xanh di cua tre*.