Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
hanh tai » thanh tai, hang tai, han tai
mai hoi » dai hoi, lai hoi, mai doi
xa hanh » xa thanh, xa khanh, va hanh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » ha nam, va nay

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 ((mai hoi) OR (mai khoi)). lieu ((va nam) or (van nam)) tuc xa hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((mai hoi) OR (mai khoi)). lieu ((va nam) OR (van nam)) tuc xa hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((mai hoi) OR (mai khoi)). lieu ((va nam) or (van nam)) tuc xa hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((mai hoi) OR (mai khoi)). lieu ((va nam) or (van nam)) tuc xa hanh tai cua tre*.