Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh viec » tinh viet, dinh viec, sinh viec
dai hoi » dai hoc, dai hai, dai moi
lai hoi » lai hoa, lai roi, mai hoi
va tinh » may tinh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » ha nam, va nay
luc va » duc va, tuc va, loc 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 sac ky nang ((dai hoi) or (lai hoi)). hieu ((va nam) OR (van nam)) luc va tinh viec cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((dai hoi) OR (lai hoi)). hieu ((va nam) OR (van nam)) luc va tinh viec cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((dai hoi) or (lai hoi)). hieu ((va nam) OR (van nam)) luc va tinh viec cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((dai hoi) or (lai hoi)). hieu ((va nam) OR (van nam)) luc va tinh viec cua triet*.