Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
va hanh » van hanh, va thanh, va danh
xang ma » tang ma, nang ma, sang ma
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va co, va dao, va bao
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 ty) OR (sach thu)) xang ma hoi. hieu ((va cac) or (va cao)) xuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) xang ma hoi. hieu ((va cac) OR (va cao)) xuc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) xang ma hoi. hieu ((va cac) or (va cao)) xuc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) xang ma hoi. hieu ((va cac) or (va cao)) xuc va hanh vi cua vat*.