Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
te cua » tue cua, le cua, de cua

You may be able to get more results by adjusting your search query.

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