Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
mai khoi » mai khoa, tai khoa, cac khoi
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
mai hoi » dai hoi, lai hoi, mai doi
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((mai hoi) or (mai khoi)). hieu ((ve cam) or (va cam)) xuc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai hoi) OR (mai khoi)). hieu ((ve cam) OR (va cam)) xuc va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((mai hoi) or (mai khoi)). hieu ((ve cam) or (va cam)) xuc va hanh tai cua tre*.