Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
truc van » truc va, thuc van, truc ban
thanh de » hanh de, thanh ve, thanh do
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ke » hieu kem, chieu ke, hieu ky
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ke cau » ket cau
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 ((sac ky) or (sach ty)) nang xa hoi. hieu ke cau truc van thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) nang xa hoi. hieu ke cau truc van thanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach ty)) nang xa hoi. hieu ke cau truc van thanh de cua tre*.