Perhaps you should try some spelling variations:
cua triet » su triet, va triet
pham chuc » pham duc, pham huu, kham chua
doc sach » hoc sach, toc sach, nuoc sach
hanh hai » thanh hai, nhanh hai, hang hai
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
chuc va » thuc va, thuc vat
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
hieu vi » hieu voi, hieu va, hieu ve
ma hoi » mai hoi, ma hoa, me hoi

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: doc sach ty nang ((ma hoi) OR (xa hoi)). hieu vi pham chuc va hanh hai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ty nang ((ma hoi) or (xa hoi)). hieu vi pham chuc va hanh hai ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: doc sach ty nang ((ma hoi) or (xa hoi)). hieu vi pham chuc va hanh hai ((cua triet) OR (cua viet))*.