Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
am thu » nam thu, cam thu, am phu
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 y nang x hoi. hieu ve ((am thu) OR (am thuc)) vat ((hanh di) or (hang di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ve ((am thu) OR (am thuc)) vat ((hanh di) OR (hang di)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ve ((am thu) OR (am thuc)) vat ((hanh di) or (hang di)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ve ((am thu) OR (am thuc)) vat ((hanh di) or (hang di)) cuu tre*.