Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
toc van » hoc van, toc san, tac van
hang di » hang doi, hang vi, hang dien
ve cac » vien cac
di cua » dai cua, doi cua, de cua
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) or (co sach)) ky nang x hoi. hieu ((ve cac) OR (va cac)) toc van hang di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang x hoi. hieu ((ve cac) OR (va cac)) toc van hang di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky nang x hoi. hieu ((ve cac) OR (va cac)) toc van hang di cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang x hoi. hieu ((ve cac) OR (va cac)) toc van hang di cua triet*.