Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
va thanh » gia thanh, ban thanh, le thanh
hac thuc » hoc thuc, ha thuc, thach thuc
cuu tre » cua tre, cau tren
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
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 ky nang xa hoi. hieu va hac thuc ((va thanh) or (va tinh)) vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu va hac thuc ((va thanh) OR (va tinh)) vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu va hac thuc ((va thanh) or (va tinh)) vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu va hac thuc ((va thanh) or (va tinh)) vi ((cuu tre) OR (cau treo))*.