Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cua » viec cua, dien cua, tien cua
hieu van » hieu va, thien van, lieu va
va nhan » van nhan, ca nhan, va phan
cau luc » cau truc, cau phuc
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va
nang ho » nang hoc, nang co, tang ho
su sach » so sach, vu sach
ho hoi » hoc hoi, hoa hoi, hoi hoi
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 sach) OR (su sach)) ky nang ho hoi. ((hieu ve) or (hieu van)) cau luc va nhan vien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ho hoi. ((hieu ve) OR (hieu van)) cau luc va nhan vien cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang ho hoi. ((hieu ve) or (hieu van)) cau luc va nhan vien cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang ho hoi. ((hieu ve) or (hieu van)) cau luc va nhan vien cua triet*.