Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tu va hanh va su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tu va hanh va su triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tu va hanh va su triet*.