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