Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
le thang » le thanh, le tang, le quang
tu sach » thu sach, su sach, te sach
nay duc » ngay doc
hieu va » lieu va, hieu qua
lo hang » ly hang, le hang, cho hang
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 thang)) xa hoi. hieu va nay duc va thanh vai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo hang) OR (le thang)) xa hoi. hieu va nay duc va thanh vai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo hang) or (le thang)) xa hoi. hieu va nay duc va thanh vai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo hang) or (le thang)) xa hoi. hieu va nay duc va thanh vai ((cua triet) OR (va triet))*.