Perhaps you should try some spelling variations:
cua triet » su triet, va triet
ca trung » cua trung, cac trung, cao trung
trung va » truong va, trang va, trung ha
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ((ma hoi) OR (xa hoi)). hieu qua ca trung va thanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((ma hoi) OR (xa hoi)). hieu qua ca trung va thanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((ma hoi) OR (xa hoi)). hieu qua ca trung va thanh vi ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((ma hoi) OR (xa hoi)). hieu qua ca trung va thanh vi ((cua triet) or (cua viet))*.