Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
hieu le » hieu ve, hieu he, hieu ly
vu sach » vu bach, vu khach
vai cua » dai cua, hai cua, lai cua
su sach » so sach
le nam » ly nam, he nam, le na
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 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) or (vu sach)) ky nang ((x hoi) or (o hoi)). hieu le nam thuc van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ((x hoi) OR (o hoi)). hieu le nam thuc van hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang ((x hoi) or (o hoi)). hieu le nam thuc van hanh vai cua triet*.