Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ve bac » ve bao, ve cac, ve ban
bo van » vo van, so van, do van
ban di » ban dai, ban dia, ban do
di cua » dai cua, doi cua, de cua

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 ky nang x ho. hieu ((ve bac) or (vien bach)) bo van ban di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. hieu ((ve bac) OR (vien bach)) bo van ban di cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. hieu ((ve bac) or (vien bach)) bo van ban di cua triet*.