Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
nay duc » ngay doc
tu sach » thu sach, su sach, te sach
le hang » le hoang, le thang, le hong
lo hang » ly hang, cho hang, le thang
hieu va » lieu va, hieu qua
va nay » va ngay, va cay

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 ((lo hang) or (le hang)) xa hoi. hieu va nay duc va thanh vi ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo hang) OR (le hang)) xa hoi. hieu va nay duc va thanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo hang) or (le hang)) xa hoi. hieu va nay duc va thanh vi ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo hang) or (le hang)) xa hoi. hieu va nay duc va thanh vi ((cua triet) OR (cua viet))*.