Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet
tham dua » tham du, pham duc, pham duy
ban hanh » ban hang
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
dua ban » dia ban, cua ban, qua ban
hanh di » hanh vi, hanh de, hang di
x hoi » o hoi, x ho, 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: thuoc sach ky nang ((x hoi) or (xa hoi)). lieu va tham dua ban hanh di ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((x hoi) OR (xa hoi)). lieu va tham dua ban hanh di ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((x hoi) or (xa hoi)). lieu va tham dua ban hanh di ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((x hoi) or (xa hoi)). lieu va tham dua ban hanh di ((cua triet) OR (va triet))*.