Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
nang o » nang co, nang ho, nang ro
va nam » van nam, ha nam
va nay » va ngay, va cay
va cua » va chua, via cua, ca cua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((do sanh) or (te sach)) ky nang o hoi. lieu ((va nam) OR (va nay)) luc van hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((do sanh) OR (te sach)) ky nang o hoi. lieu ((va nam) OR (va nay)) luc van hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((do sanh) or (te sach)) ky nang o hoi. lieu ((va nam) OR (va nay)) luc van hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: ((do sanh) or (te sach)) ky nang o hoi. lieu ((va nam) OR (va nay)) luc van hanh va cua triet*.