Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
phan duc » pham duc, phan tu, phan dau
su triet » su viet, su tien, ve triet
hieu ke » hieu kem, chieu ke, hieu ky
va danh » va dinh, va dan, va hanh
ty nang » ky nang, ty hang, ly nang
ke phan » ve phan, kenh phan, ke thang
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) OR (ty xang)) x hoi. hieu ke phan duc ((va danh) or (va thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) x hoi. hieu ke phan duc ((va danh) OR (va thanh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ty xang)) x hoi. hieu ke phan duc ((va danh) or (va thanh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ty xang)) x hoi. hieu ke phan duc ((va danh) or (va thanh)) vi su triet*.