Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
day hanh » day nhanh, day thanh, dao hanh
su sach » so sach
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, x ho

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 (vu sach)) y nang x hoi. hieu ve ((nam thuc) or (am thuc)) day hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang x hoi. hieu ve ((nam thuc) OR (am thuc)) day hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang x hoi. hieu ve ((nam thuc) or (am thuc)) day hanh vi cuu tre*.