Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh hai » thanh hai, nhanh hai, hang hai
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hai cua » thai cua, dai cua, hoi cua
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: thu sach ty ((nang ma) OR (sang ma)) hoi. hieu ((va cac) or (va cao)) xuc va hanh hai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang ma) OR (sang ma)) hoi. hieu ((va cac) OR (va cao)) xuc va hanh hai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang ma) OR (sang ma)) hoi. hieu ((va cac) or (va cao)) xuc va hanh hai cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang ma) OR (sang ma)) hoi. hieu ((va cac) or (va cao)) xuc va hanh hai cua vat*.