Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tai khoa » da khoa, noi khoa
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
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: tu sach ky nang ((mai hoi) or (tai khoa)). hieu ((ve cam) or (va cam)) xuc va hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (tai khoa)). hieu ((ve cam) OR (va cam)) xuc va hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) or (tai khoa)). hieu ((ve cam) or (va cam)) xuc va hanh tai cuu tre*.