Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
va hang » van hang, va nang, va hanh
va lang » va nang, hoa lang
cam tuc » cam xuc, cam tu, nam thuc
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: cuon sach ty lang xa hoi. ((hieu ve) or (hieu qua)) cam tuc ((va hang) OR (va lang)) di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cuon sach ty lang xa hoi. ((hieu ve) OR (hieu qua)) cam tuc ((va hang) OR (va lang)) di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cuon sach ty lang xa hoi. ((hieu ve) or (hieu qua)) cam tuc ((va hang) OR (va lang)) di su triet".
• Adding a wildcard symbol may retrieve word variants: cuon sach ty lang xa hoi. ((hieu ve) or (hieu qua)) cam tuc ((va hang) OR (va lang)) di su triet*.