Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
ve cac » va cac, vien cac
vi cua » vai cua, di cua
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao
cua te » cua tu
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 ky) or (cac ky)) nang o hoi. hieu ((va cam) or (ve cac)) xuc va hanh vi cua te~.
• 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 (ve cac)) xuc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) nang o hoi. hieu ((va cam) or (ve cac)) xuc va hanh vi cua te*.