Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
va thanh » gia thanh, va tinh, le thanh
cac thuc » cach thuc, cac thu, can thuc
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien 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 lang xa hoi. hieu ve cac thuc ((va thanh) OR (ban thanh)) va ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang xa hoi. hieu ve cac thuc ((va thanh) OR (ban thanh)) va ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang xa hoi. hieu ve cac thuc ((va thanh) OR (ban thanh)) va ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. hieu ve cac thuc ((va thanh) OR (ban thanh)) va ((cua tre) or (cua viet))*.