Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » su sach, te sach, tu cach
van bac » van ban, van bao, van hac
lai cua » dai cua, hai cua, lai chau
nang o » nang co, nang ho, nang ro
bac vo » bac bo, bac ho, bac va
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) ky nang o hoi. hieu van bac vo van hanh lai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang o hoi. hieu van bac vo van hanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang o hoi. hieu van bac vo van hanh lai cua triet*.