Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
ma hoi » xa hoi, ma hoa, me hoi
va bac » van bac, va bai, va bao
dai va » mai va
vi cua » vai cua, di cua

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 ((ma hoi) or (mai hoi)). lieu ((va bac) or (va cac)) dai va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (mai hoi)). lieu ((va bac) OR (va cac)) dai va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) or (mai hoi)). lieu ((va bac) or (va cac)) dai va hanh vi cua vat*.