Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
tan hanh » tan thanh, tang hanh, toan hanh
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi

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