Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dai trung » dai truong, tai trung, dac trung
trung va » truong va, trang va, trung ha
hanh lam » thanh lap, hanh kem, hanh va
hieu ca » hieu cac, hieu cua, hieu va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su viet » so viet
y nang » ly nang, v nang, may nang
ca dai » can dai, cac dai, cua dai

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)) ma hoa. hieu ca dai trung va hanh lam ((cua tre) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y nang) OR (ky nang)) ma hoa. hieu ca dai trung va hanh lam ((cua tre) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y nang) or (ky nang)) ma hoa. hieu ca dai trung va hanh lam ((cua tre) or (su viet))*.