Perhaps you should try some spelling variations:
cuu tre » cua tre, cau tren, cau treo
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
hieu va » hieu qua
hac tuc » thac toc, thai tuc
vi cuu » vi luu, vinh cuu
tuc va » thuc va, truc va, tuc xa
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
o hoc » co hoc, mo hoc, so hoc
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 ky nang ((x hoi) or (o hoc)). ((hieu va) OR (lieu va)) hac tuc va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((x hoi) OR (o hoc)). ((hieu va) OR (lieu va)) hac tuc va danh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((x hoi) or (o hoc)). ((hieu va) OR (lieu va)) hac tuc va danh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) or (o hoc)). ((hieu va) OR (lieu va)) hac tuc va danh vi cuu tre*.