Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, dua tren
goc va » loc va, doc va, uoc va
x hoi » xa hoi, o hoi, x ho

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