Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh giau » thanh gian, danh gia, anh giao
giau cua » gian cua, gia cua, dieu cua
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
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: tu sach y nang ((x hoi) OR (x ho)). hieu ve cac ((duc van) or (duc tan)) hanh giau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). hieu ve cac ((duc van) OR (duc tan)) hanh giau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (x ho)). hieu ve cac ((duc van) or (duc tan)) hanh giau cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (x ho)). hieu ve cac ((duc van) or (duc tan)) hanh giau cua triet*.