Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hieu va » lieu va, hieu qua
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
va cam » va cham, va cac, va cao
nang o » nang co, nang ho, nang ro
luc va » tuc va, loc va
o hoi » co hoi, o hoc, o hai

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 hoi. hieu va cam ((luc va) or (duc va)) hang hai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang o hoi. hieu va cam ((luc va) OR (duc va)) hang hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky nang o hoi. hieu va cam ((luc va) or (duc va)) hang hai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang o hoi. hieu va cam ((luc va) or (duc va)) hang hai ((cua tre) OR (cuu tre))*.