Perhaps you should try some spelling variations:
tinh voi » trinh voi, binh voi, minh voi
tinh doi » trinh doc, trinh do, tinh hoc
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc
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 voi) OR (tinh doi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (duy khanh)) ky nang x hoi. hieu va nam tu va ((tinh voi) OR (tinh doi)) 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 voi) OR (tinh doi)) cua tre*.