Perhaps you should try some spelling variations:
van thang » van thanh, van khang, van hang
tan hang » tan khang, ban hang, van hang
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
tu ban » thu ban, te ban
ban ky » van ky, dan ky
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky nang xa hoi. hieu va pham duc ((tan hang) or (van thang)) di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky nang xa hoi. hieu va pham duc ((tan hang) OR (van thang)) di va triet.
• Adding a wildcard symbol may retrieve word variants: tu ban ky nang xa hoi. hieu va pham duc ((tan hang) or (van thang)) di va triet*.