Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh de » hanh de, thanh ve, thanh do
te sach » toc sach
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu qua)) cam duc van thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu qua)) cam duc van thanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu qua)) cam duc van thanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu qua)) cam duc van thanh de cua tre*.