Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
sach ky » sac ky, sach kem, sach hay
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai

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) OR (sach ty))) or (sach y)) nang o hoi. hieu ve cac duc van thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((((sach ky) OR (sach ty))) OR (sach y)) nang o hoi. hieu ve cac duc van thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((((sach ky) OR (sach ty))) or (sach y)) nang o hoi. hieu ve cac duc van thanh tai cua tre*".