Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
vu khanh » vu thanh, van khanh, duy khanh
vu sach » vu bach, su sach, vu khach
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nam tu » nam thu, nam thuc
vi cua » vai cua, di cua
va nam » van nam, ha nam, va nay
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 (vu khanh)) ky nang x hoi. hieu va nam tu ((va thanh) OR (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khanh)) ky nang x hoi. hieu va nam tu ((va thanh) OR (va tinh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khanh)) ky nang x hoi. hieu va nam tu ((va thanh) OR (va tinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khanh)) ky nang x hoi. hieu va nam tu ((va thanh) OR (va tinh)) vi cua tre*.