Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
vai cuu » vai cua
su sach » vu sach
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
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 (so sach)) ky nang x hoi. hieu va cam ((thuc va) OR (thuc day)) hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang x hoi. hieu va cam ((thuc va) OR (thuc day)) hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang x hoi. hieu va cam ((thuc va) OR (thuc day)) hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang x hoi. hieu va cam ((thuc va) OR (thuc day)) hanh vai cuu tre*.