Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
hieu va » lieu va, hieu qua
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
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 sai ky nang o hoi. hieu va cam ((luc va) OR (duc va)) hanh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang o hoi. hieu va cam ((luc va) OR (duc va)) hanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang o hoi. hieu va cam ((luc va) OR (duc va)) hanh hoi cua tre*.