Perhaps you should try some spelling variations:
cua triet » su triet, va triet
van doanh » toan doanh, van dong, van thanh
cua viet » ca viet, hoa viet, cua vat
van danh » van anh, van hanh, van manh
tu sach » thu sach, su sach, te sach
cac dac » cac dan, cac dai, cac bac
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
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 y nang o hoi. hieu ve cac dac ((van danh) or (van doanh)) gia ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu ve cac dac ((van danh) OR (van doanh)) gia ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu ve cac dac ((van danh) or (van doanh)) gia ((cua triet) or (cua viet))*.