Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
mai khoi » mai khoa, tai khoa, cac khoi
bach xuc » bach tuoc, bach xuan, bach hue
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
mai hoi » dai hoi, mai doi, mai hoa
lai hoi » dai hoi, lai hoa, lai roi
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc 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: tu sach tu nang ((((mai hoi) OR (lai hoi))) OR (mai khoi)). hieu vien bach xuc va hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang ((((mai hoi) OR (lai hoi))) OR (mai khoi)). hieu vien bach xuc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((((mai hoi) OR (lai hoi))) OR (mai khoi)). hieu vien bach xuc va hanh vi cua vat*.