Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
cai hoi » cau hoi, dai hoi, cai hoa
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
vu bac » vu bach, vu ban, xu bac
bac ky » cac ky, ban ky, sac ky
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bac ky nang cai hoi. hieu va cam luc ((van hanh) or (va danh)) than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bac ky nang cai hoi. hieu va cam luc ((van hanh) OR (va danh)) than cua tre.
• Adding a wildcard symbol may retrieve word variants: vu bac ky nang cai hoi. hieu va cam luc ((van hanh) or (va danh)) than cua tre*.