Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
su triet » su viet, su tien, ve triet
sach kha » sach nha, sach ha, sach tham
kha nang » phap nang, ky nang, ki nang
nam thuc » nam thuoc, am thuc, nam thu
kien su » nien su, tien su, vien sau
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ca thu » cac thu, cam thu, ca tru
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach kha nang ((x hoi) OR (x ho)). hieu ve ((ca thu) or (nam thuc)) va hanh kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach kha nang ((x hoi) OR (x ho)). hieu ve ((ca thu) OR (nam thuc)) va hanh kien su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach kha nang ((x hoi) OR (x ho)). hieu ve ((ca thu) or (nam thuc)) va hanh kien su triet".
• Adding a wildcard symbol may retrieve word variants: su sach kha nang ((x hoi) OR (x ho)). hieu ve ((ca thu) or (nam thuc)) va hanh kien su triet*.