Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai va » thai van
ky lang » ky nang, ky dang, ky tang
va hanh » van hanh, va thanh, ban hanh
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va, hieu qua
xoa doi » hoa doi
va cao » va cac, va co, va dao
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, xa hoi, va hoi
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky lang ((((ha hoi) or (ha noi))) or (xoa doi)). hieu va cao hoc va hanh thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky lang ((((ha hoi) OR (ha noi))) OR (xoa doi)). hieu va cao hoc va hanh thai va thiet.
• Adding a wildcard symbol may retrieve word variants: su xac ky lang ((((ha hoi) or (ha noi))) or (xoa doi)). hieu va cao hoc va hanh thai va thiet*.