Perhaps you should try some spelling variations:
tan khang » van khang, tao khang, tinh khang
khang di » hang di, khang vi, khang voi
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
cu dan » cua dan, ca dan, co dan
tu ban » thu ban, te ban
di va » dai va, di vao, doi va
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: ((cu dan) or (tu ban)) ky nang xa hoi. ((thien van) OR (thi van)) pham duc tan khang di va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cu dan) OR (tu ban)) ky nang xa hoi. ((thien van) OR (thi van)) pham duc tan khang di va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cu dan) or (tu ban)) ky nang xa hoi. ((thien van) OR (thi van)) pham duc tan khang di va thiet".
• Adding a wildcard symbol may retrieve word variants: ((cu dan) or (tu ban)) ky nang xa hoi. ((thien van) OR (thi van)) pham duc tan khang di va thiet*.