Perhaps you should try some spelling variations:
tinh voi » trinh voi, tinh doi, binh voi
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
va tinh » may tinh
voi cua » hoi cua, doi cua, moi cua
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc
x hoi » o hoi, x ho, 5 hoi

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) OR (xa hoi)). hieu va nam tu va tinh voi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (duy khanh)) ky nang ((x hoi) OR (xa hoi)). hieu va nam tu va tinh voi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (duy khanh)) ky nang ((x hoi) OR (xa hoi)). hieu va nam tu va tinh voi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (duy khanh)) ky nang ((x hoi) OR (xa hoi)). hieu va nam tu va tinh voi cua tre*.