Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
hieu van » hieu va, thien van, lieu va
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
mang xa » lang xa, mang may, dang xay
sac ky » cac ky, sai ky

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

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