Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cac giao » cach giao, cac giai, ca giao
su triet » su viet, su tien, ve triet
danh vai » danh sai, danh va, doanh van
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
giao va » gia va, giai va, gian va
va danh » va dinh, va dan, va hanh
ty nang » ky nang, ty xang, ly nang
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 ((ty nang) OR (ty hang)) x hoi. hieu va cac giao va danh vai ((su triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty nang) OR (ty hang)) x hoi. hieu va cac giao va danh vai ((su triet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ty nang) OR (ty hang)) x hoi. hieu va cac giao va danh vai ((su triet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty nang) OR (ty hang)) x hoi. hieu va cac giao va danh vai ((su triet) or (cua vat))*.