Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
cuu thuc » cuu tac
van cam » van nam, van lam, van cau
va danh » va dinh, va hanh, dia danh
y nang » ly nang, v nang, may nang
va dan » ca dan, va dao, va dau
vi cuu » vi luu, vinh cuu
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 ((y nang) OR (ky nang)) x hoi. hieu van cam xuc ((va danh) or (va dan)) vi cuu thuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y nang) OR (ky nang)) x hoi. hieu van cam xuc ((va danh) OR (va dan)) vi cuu thuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y nang) OR (ky nang)) x hoi. hieu van cam xuc ((va danh) or (va dan)) vi cuu thuc".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y nang) OR (ky nang)) x hoi. hieu van cam xuc ((va danh) or (va dan)) vi cuu thuc*.