Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
su sach » so sach
hieu va » lieu va, hieu qua
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
di cua » dai cua, doi cua, de cua
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 sach) or (su sach))) or (vay khach)) ky nang x hoi. hieu va cam tu va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (su sach))) OR (vay khach)) ky nang x hoi. hieu va cam tu va tinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) or (su sach))) or (vay khach)) ky nang x hoi. hieu va cam tu va tinh di cua tre*.