Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
van hanh » van thanh, ban hanh, van anh
cai hoi » cau hoi, dai hoi, cai hoa
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » va thanh, va danh, ban hanh
cuc tre » duc tre, cua tre, cuu tre
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang cai hoi. hieu va cam duc ((va hanh) OR (van hanh)) tai cuc tre~.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang cai hoi. hieu va cam duc ((va hanh) or (van hanh)) tai cuc tre*.