Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac dai » cac dan, cac bai, can dai
van cac » van hac, van cau, van bac
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
me hoi » le hoi
dai va » mai va
di cua » dai cua, doi cua, de cua

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 y nang ((((ma hoa) or (me hoi))) or (mai hoi)). hieu van cac dai va hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((((ma hoa) OR (me hoi))) OR (mai hoi)). hieu van cac dai va hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((((ma hoa) or (me hoi))) or (mai hoi)). hieu van cac dai va hanh di cua vat*.