Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
cac tuc » cac toc, cac tu, cac tac
dai vai » dai va, dai hai, dai tai
vai cua » dai cua, hai cua, lai cua
nang o » nang co, nang ho, nang ro
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. lieu va cac tuc xa dai vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang o hoi. lieu va cac tuc xa dai vai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang o hoi. lieu va cac tuc xa dai vai cua triet*.