Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
dinh vai » dinh van, dinh vi, dinh va
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
ve am » va am

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 ky nang ((x hoi) or (o hoi)). hieu ve am thuc va dinh vai ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (o hoi)). hieu ve am thuc va dinh vai ((su triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (o hoi)). hieu ve am thuc va dinh vai ((su triet) or (va triet))*.