Perhaps you should try some spelling variations:
xanh tai » hanh tai, anh tai, vanh tai
cua tre » cua te, cuu tre, cua triet
vuc van » duc van, luc van, thuc van
xanh di » danh di, vanh dai
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
san ky » sang ky, van ky, dan ky
ve cac » va cac, vien cac
tu san » thu san, tu ban, tu can
x hoi » o hoi, x ho, 5 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 san ky nang ((x hoi) or (xa hoi)). hieu ve cac vuc van ((xanh di) or (xanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((x hoi) OR (xa hoi)). hieu ve cac vuc van ((xanh di) OR (xanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((x hoi) or (xa hoi)). hieu ve cac vuc van ((xanh di) or (xanh tai)) cua tre*.