Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va nha » va nho, ve nha
va dan » ca dan, va dao, va dap
va dau » va dao
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang xa hoi. hieu va nha thuoc ((va dan) or (va dau)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. hieu va nha thuoc ((va dan) OR (va dau)) va cuu tre.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu va nha thuoc ((va dan) or (va dau)) va cuu tre*.