Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cau treo » cau theo, cau tren, cau triet
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
cuu tre » cua tre, cau tren
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang o hai. hieu va ((nam thuc) or (nha thuoc)) van hanh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o hai. hieu va ((nam thuc) OR (nha thuoc)) van hanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang o hai. hieu va ((nam thuc) or (nha thuoc)) van hanh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hai. hieu va ((nam thuc) or (nha thuoc)) van hanh vi ((cuu tre) OR (cau treo))*.