Perhaps you should try some spelling variations:
thac toc » cac toc, thac cac, thi toc
hieu va » lieu va, hieu qua
va thac » van thac, va thuc, va tac
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu san, tu bac
toc va » hoc va, toc ta, tuc va
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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