Perhaps you should try some spelling variations:
sach tham » sach nha
cua viet » ca viet, hoa viet, cua vat
sach thu » sach thue, sach thieu, cach thuc
hanh hai » thanh hai, nhanh hai, hang hai
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
mang xa » lang xa, mang may, dang xay
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d 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) OR (sach tham)) ((mang xa) or (nang x)) hoi. hieu v pham duc va hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tham)) ((mang xa) OR (nang x)) hoi. hieu v pham duc va hanh hai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach tham)) ((mang xa) or (nang x)) hoi. hieu v pham duc va hanh hai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach tham)) ((mang xa) or (nang x)) hoi. hieu v pham duc va hanh hai cua viet*.