Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
duc manh » suc manh, duc anh, duc minh
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
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: thuat sach ky nang ((x hoi) OR (x ho)). lieu va tham ((duc manh) or (duc tan)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((x hoi) OR (x ho)). lieu va tham ((duc manh) OR (duc tan)) hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((x hoi) OR (x ho)). lieu va tham ((duc manh) or (duc tan)) hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((x hoi) OR (x ho)). lieu va tham ((duc manh) or (duc tan)) hanh di cua triet*.