Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc
vi cua » vai cua, di 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 (duy khanh)) ky nang x hoi. hieu va nam tu va tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (duy khanh)) ky nang x hoi. hieu va nam tu va tinh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (duy khanh)) ky nang x hoi. hieu va nam tu va tinh vi cua tre*.