Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
chu bang » thu bang, chuc nang, chu quang
hanh dao » lanh dao, thanh dat, thanh dam
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
tu sach » thu sach, su sach, te sach
ki nang » ky nang
ve chat » van chat
xuc va » duc va, tuc va, luc va
dao su » dao suu, dan su, cao su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((chu bang) or (ki nang)) xa hoi. hieu ((ve chat) OR (va chat)) xuc va hanh dao su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((chu bang) OR (ki nang)) xa hoi. hieu ((ve chat) OR (va chat)) xuc va hanh dao su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((chu bang) or (ki nang)) xa hoi. hieu ((ve chat) OR (va chat)) xuc va hanh dao su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((chu bang) or (ki nang)) xa hoi. hieu ((ve chat) OR (va chat)) xuc va hanh dao su triet*.