Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hang » van hang, va nang, va lang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
co hoi » co hoc, co loi
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
o lai » o lao

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 ((co hoi) or (o lai)). hieu va cam luc va hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang ((co hoi) OR (o lai)). hieu va cam luc va hang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang ((co hoi) or (o lai)). hieu va cam luc va hang hai cua tre*.