Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh vi » hanh vi, thanh va, thanh ve
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
ve cac » va cac, vien cac
ve cam » ve cham, ve cai, ve cau
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang xa hoi. hieu ((((ve cam) or (va cam))) or (ve cac)) thuc dan thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. hieu ((((ve cam) OR (va cam))) OR (ve cac)) thuc dan thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. hieu ((((ve cam) or (va cam))) or (ve cac)) thuc dan thanh vi cua tre*.