Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
tam thuc » tham thuc, am thuc, nam thuc
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
va tam » van tam, va tham, va tac
di cua » dai cua, doi cua, de cua

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 ((xa hoi) or (((mai hoi) OR (lai hoi)))). lieu va tam thuc va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((xa hoi) OR (((mai hoi) OR (lai hoi)))). lieu va tam thuc va hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((xa hoi) or (((mai hoi) OR (lai hoi)))). lieu va tam thuc va hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((xa hoi) or (((mai hoi) OR (lai hoi)))). lieu va tam thuc va hanh di cua triet*.