Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cuu tre » cua tre, cau tren, cau treo
bao luc » bao thuc
cao luc » cao duc, cao suc, cau luc
va hanh » va thanh, va danh, ban hanh
ca cuu » cap cuu, cua cuu, ca cua
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
nang o » nang co, nang ho, nang ro
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: tu bai ky nang o hai. lieu va ((cao luc) or (bao luc)) ((va hanh) OR (van hanh)) ca cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang o hai. lieu va ((cao luc) OR (bao luc)) ((va hanh) OR (van hanh)) ca cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky nang o hai. lieu va ((cao luc) or (bao luc)) ((va hanh) OR (van hanh)) ca cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang o hai. lieu va ((cao luc) or (bao luc)) ((va hanh) OR (van hanh)) ca cuu tre*.