Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
tu ban » thu ban, te ban
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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) or (tu ban)) ky nang x hoi. hieu va tham thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu ban)) ky nang x hoi. hieu va tham thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu ban)) ky nang x hoi. hieu va tham thuc va hanh vi cua tre*.