Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
su sach » vu sach
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
luu tre » luu tru, cuu tre, luy tre
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
vi luu » vi lua
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) or (so sach)) y nang o hai. hieu va ((nam thuc) or (nha thuoc)) van hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang o hai. hieu va ((nam thuc) OR (nha thuoc)) van hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang o hai. hieu va ((nam thuc) or (nha thuoc)) van hanh vi luu tre*.