Perhaps you should try some spelling variations:
vien dai » hien dai
hanh hai » thanh hai, nhanh hai, hang hai
hau theo » cau theo, dau theo, hanh theo
va hanh » van hanh, va thanh, va danh
hai hau » hai chau, dai hau, hai hai
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
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: su sac ky nang o hoi. hieu ((ve cac) or (vien dai)) xuc va hanh hai hau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang o hoi. hieu ((ve cac) OR (vien dai)) xuc va hanh hai hau theo.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang o hoi. hieu ((ve cac) or (vien dai)) xuc va hanh hai hau theo*.