Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vien cac » vien bach, vien dai, vien da
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao
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 ky) or (cac ky)) nang o hoi. hieu ((va cam) or (vien cac)) xuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (cac ky)) nang o hoi. hieu ((va cam) OR (vien cac)) xuc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) nang o hoi. hieu ((va cam) or (vien cac)) xuc va hanh vi cua viet*.