Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh dat » thanh san, thanh van, thanh ha
te sach » toc sach
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac

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: te sach ((y nang) OR (v nang)) ma hoa. hieu ve cac duc va ((thanh dat) OR (thanh hai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (v nang)) ma hoa. hieu ve cac duc va ((thanh dat) or (thanh hai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (v nang)) ma hoa. hieu ve cac duc va ((thanh dat) or (thanh hai)) cua tre*.