Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nam thuc » nam thuoc, am thuc, nam thu
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nha hoc » nha thuoc, khoa hoc, nha nuoc
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
vi cuu » vi luu, vinh cuu
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 hoc)) van thanh vi cuu tre~.
• 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 hoc)) van thanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hai. hieu va ((nam thuc) or (nha hoc)) van thanh vi cuu tre*.