Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cao » van dao, van hao, van cau
van bao » van ban, van dao
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
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: te sach ty nang o hoi. hieu ((van cao) or (van bao)) duc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang o hoi. hieu ((van cao) OR (van bao)) duc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang o hoi. hieu ((van cao) or (van bao)) duc va hanh vi cua viet*.