Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
tinh da » tinh va, tinh gia, tinh lao
va tinh » may tinh
qua cam » qua cham, qua cac, qua ca
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, ma hoa, me hoi

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

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