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
sang ma » tang ma, nang ma, sang tao
hai cua » thai cua, dai cua, hoi cua
va cao » va co, va dao, va bao
luc va » duc va, tuc va, loc 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 ((mang may) or (sang ma)) hoi. hieu ((va cac) or (va cao)) luc va hanh hai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((mang may) OR (sang ma)) hoi. hieu ((va cac) OR (va cao)) luc va hanh hai cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((mang may) or (sang ma)) hoi. hieu ((va cac) or (va cao)) luc va hanh hai cua vat*.