Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
y hang » ly hang, ty hang, yu hang
hang x » nang x, hoang xa, chang xu
ve cac » vien cac
x hoi » xa hoi, o hoi, x ho

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 hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang x hoi. hieu ((ve cac) OR (va cac)) duc va hanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi ((cua tre) or (cua triet))*.