Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day dinh » dao dinh, day danh, dang dinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dinh vi » dinh ve, dinh viet, dinh tri
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((x hoi) or (x ho)). ((hieu ve) or (thien van)) nam thuc day dinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((x hoi) OR (x ho)). ((hieu ve) OR (thien van)) nam thuc day dinh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((x hoi) or (x ho)). ((hieu ve) or (thien van)) nam thuc day dinh vi cuu tre*.