Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cham duc » pham duc, pham duy, phan duc
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho

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: su sach ty nang x hoi. hieu ve ((cham duc) OR (cham soc)) van hanh dai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu ve ((cham duc) or (cham soc)) van hanh dai ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ve ((cham duc) or (cham soc)) van hanh dai ((cua triet) OR (cua viet))*.