Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
su sach » vu sach
van cau » van dau, van hau, van chat
so sach » so sanh, bo sach, co sach
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang x hoi. hieu van cau thuc va danh vai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang x hoi. hieu van cau thuc va danh vai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang x hoi. hieu van cau thuc va danh vai ((cua tre) OR (cuu tre))*.