Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van anh
viec cac » vien cac, viec cua, viec lam
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
ky lang » ky nang, ky dang, tay lang
su sach » so sach, vu sach
vi va » vi van, vai va, bi va
vu va » vu van, tu va, su va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky tang)) van hoi. hieu viec cac tac van hanh ((vi va) OR (vu va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky tang)) van hoi. hieu viec cac tac van hanh ((vi va) or (vu va)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky tang)) van hoi. hieu viec cac tac van hanh ((vi va) or (vu va)) triet*.