Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
doc sach » hoc sach, toc sach, nuoc sach
thuoc va » thuc va, thuoc ma, thuong va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cuu tre » cua tre, cau tren, cau treo
va ban » van ban, va bai, va bao
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) or (lieu va)) nam thuoc va ban va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. ((hieu va) OR (lieu va)) nam thuoc va ban va cuu tre.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. ((hieu va) or (lieu va)) nam thuoc va ban va cuu tre*.