Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac dai » cac dan, cac bai, can dai
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((ma hoi) or (mai khoi)). lieu va cac dai va hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (mai khoi)). lieu va cac dai va hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) or (mai khoi)). lieu va cac dai va hanh vai cua vat*.