Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, me hoi
ve am » va am
thiet » thieu

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