Perhaps you should try some spelling variations:
hac thuc » hoc thuc, ha thuc, thach thuc
va thanh » gia thanh, ban thanh, le thanh
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
va nang » van nang, da nang, cam nang
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
va hac » van hac, va khac, va cac

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 ((y nang) or (va nang)) xa hoi. hieu va hac thuc ((va thanh) or (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (va nang)) xa hoi. hieu va hac thuc ((va thanh) OR (va tinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) or (va nang)) xa hoi. hieu va hac thuc ((va thanh) or (va tinh)) vi cua tre*.