Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
quoc ban » quoc bao, quoc lan, quoc quan
thai cua » than cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang o hai. hieu va cam ((((thuc va) or (quoc ban))) or (duc tan)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang o hai. hieu va cam ((((thuc va) OR (quoc ban))) OR (duc tan)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sac ky nang o hai. hieu va cam ((((thuc va) or (quoc ban))) or (duc tan)) hanh thai cua tre*.