Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
va triet » va thiet, va trien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty xang, ty hang
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
cua te » cua tu
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: ((doc sach) or (hoc sach)) ty nang o hoi. hieu ve cam duc va hanh vi ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (hoc sach)) ty nang o hoi. hieu ve cam duc va hanh vi ((cua te) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (hoc sach)) ty nang o hoi. hieu ve cam duc va hanh vi ((cua te) or (va triet))*.