Perhaps you should try some spelling variations:
bat thanh » ban thanh, bac thanh, dat thanh
cua viet » ca viet, hoa viet, cua dieu
thanh de » hanh de, thanh ve, thanh do
so sach » so sanh, bo sach, co sach
luc bat » suc bat, luc nhat, luat bat
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
ma hoi » mai hoi, xa hoi, ma hoa
ve cau » ke cau, va cau, ve cac

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 ((ty hang) or (ly hang)) ma hoi. hieu ve cau luc bat thanh de ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty hang) OR (ly hang)) ma hoi. hieu ve cau luc bat thanh de ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty hang) or (ly hang)) ma hoi. hieu ve cau luc bat thanh de ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty hang) or (ly hang)) ma hoi. hieu ve cau luc bat thanh de ((cua viet) OR (cua vat))*.