Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam tuc » cam xuc, cam tu, dam thuc
xa hanh » xa thanh, xa khanh, va hanh
mang xa » lang xa, mang may, dang xay
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

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