Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
ve chinh » te chinh, va chinh, che chinh
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
thuc va » thuc vat, thuc dan, thuc day
dang xa » dang xay, dang ha, dang va
tu sach » thu sach, su sach, te sach

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 ky ((dang xa) OR (lang xa)) hoi. hieu ((ve chinh) or (va cham)) thuc va thanh dat va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xa) OR (lang xa)) hoi. hieu ((ve chinh) OR (va cham)) thuc va thanh dat va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang xa) OR (lang xa)) hoi. hieu ((ve chinh) or (va cham)) thuc va thanh dat va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xa) OR (lang xa)) hoi. hieu ((ve chinh) or (va cham)) thuc va thanh dat va triet*.