Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
bac dai » bach mai
sach ky » sac ky, sach y, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
dai va » mai va
va bac » van bac, va cac, va bai
vi cua » vai cua, di cua
ma hoi » xa hoi, ma hoa, me hoi

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) OR (sach ty)) nang ((ma hoi) or (mai hoi)). lieu va bac dai va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang ((ma hoi) OR (mai hoi)). lieu va bac dai va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang ((ma hoi) or (mai hoi)). lieu va bac dai va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang ((ma hoi) or (mai hoi)). lieu va bac dai va hanh vi cua vat*.