Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cac thuc » cach thuc, cac thu, can thuc
voi nang » voi hang, hoi nang, voi rang
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
vu nang » vuc nang, va nang, vu dang
ve cac » va cac, vien cac

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 ((voi nang) or (vu nang)) xa hoi. hieu ve cac thuc va hanh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((voi nang) OR (vu nang)) xa hoi. hieu ve cac thuc va hanh di ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((voi nang) or (vu nang)) xa hoi. hieu ve cac thuc va hanh di ((cua triet) or (va triet))*.