Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
va nhan » van nhan, va phan, va nha
luc van » luoc van, luu van, duc van
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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) or (so sach)) ky nang x hoi. hieu ((va nhan) OR (ca nhan)) luc van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang x hoi. hieu ((va nhan) OR (ca nhan)) luc van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky nang x hoi. hieu ((va nhan) OR (ca nhan)) luc van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang x hoi. hieu ((va nhan) OR (ca nhan)) luc van hanh vi cua triet*.