Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, tu cach
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
te sach » toc sach
ve cam » ve cham, ve cac, va cam
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
thiet » thieu

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)) ky nang o hoi. hieu ve cam duc va thanh va ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang o hoi. hieu ve cam duc va thanh va ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang o hoi. hieu ve cam duc va thanh va ((va triet) OR (va thiet))*".