Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hoc khoi » hoc khoa, hoc hoa, hoc noi
thai cua » than cua, tai cuc, tri cua
anh hanh » anh thanh, xanh hanh, anh anh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hoc hoi » hoc hoa, hoc noi, hoc moi

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