Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
hanh dai » hanh tai, vanh dai, thanh dat
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
sach 6 » sach y, sach 2
6 lang » o lang, _ lang
va cau » van cau, va cac, va dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 6 lang xa hoi. lieu va cau thuc vat ((hanh dai) OR (hanh dao)) cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach 6 lang xa hoi. lieu va cau thuc vat ((hanh dai) or (hanh dao)) cua triet*.