Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
cam tu » cam thu, dam tu, tam tu
nam tu » nam thu, nam thuc
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: ((vu bach) or (so sach)) ky nang x hoi. hieu va ((cam tu) or (nam tu)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (so sach)) ky nang x hoi. hieu va ((cam tu) OR (nam tu)) va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (so sach)) ky nang x hoi. hieu va ((cam tu) or (nam tu)) va hanh vi cuu tre*.