Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cau tren » cu tren, dau tren, ca tren
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((nang xa) OR (lang xa)) hoi. hieu ve pham duc va hanh vi ((cau tren) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) OR (lang xa)) hoi. hieu ve pham duc va hanh vi ((cau tren) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) OR (lang xa)) hoi. hieu ve pham duc va hanh vi ((cau tren) or (cua viet))*.