Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
tang ma » mang may, tang van
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
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: thuoc ((sach ky) OR (sach y)) tang ma hoi. hieu van cac dat va hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) OR (sach y)) tang ma hoi. hieu van cac dat va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) OR (sach y)) tang ma hoi. hieu van cac dat va hanh vi cua vat*.