Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh tai, hanh van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cuu tre » cua tre, cau tren, cau treo
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
tu sac » tu sach, tu cac, tu san

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 dang ((mai hoi) OR (lai hoi)). hieu ve cac nuoc va ((hanh vai) OR (hanh va)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang ((mai hoi) OR (lai hoi)). hieu ve cac nuoc va ((hanh vai) OR (hanh va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang ((mai hoi) OR (lai hoi)). hieu ve cac nuoc va ((hanh vai) OR (hanh va)) cuu tre*.