Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
sach tu » sach thu, cach tu, sach uu
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va co, va dao, va bao
xuc va » duc va, tuc va, luc va

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