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
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
tu sac » tu sach, tu cac, tu san
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 sac 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 sac ky nang ((x hoi) OR (xa hoi)). hieu ve cac vuc van ((xanh di) OR (xanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac 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 sac ky nang ((x hoi) or (xa hoi)). hieu ve cac vuc van ((xanh di) OR (xanh tai)) cua tre*.