Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
mang xa » lang xa, mang may, dang xay
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
hieu y » hieu ky, hieu ly, hiem y
y pham » my pham, d pham, v pham

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 thu ((mang xa) or (nang x)) hoi. hieu y pham duc va hanh tai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((mang xa) OR (nang x)) hoi. hieu y pham duc va hanh tai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((mang xa) or (nang x)) hoi. hieu y pham duc va hanh tai cua vat*.