Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
hieu ve » hieu van
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang o » nang co, nang ho, nang ro
bac so » bac son, bac si, bac bo
so van » su van, vo van
y nang » ky nang, ly nang, v nang
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 (te sach)) y nang o hoi. ((hieu ve) or (hieu va)) bac so van hanh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang o hoi. ((hieu ve) OR (hieu va)) bac so van hanh doi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang o hoi. ((hieu ve) or (hieu va)) bac so van hanh doi cua triet*.