Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
hac thuc » hoc thuc, ha thuc, thach thuc
cua tre » cuu tre, cua triet, dua tren
va tinh » may tinh
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va hac » van hac, va khac, va cac
cua te » cua tu

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