Perhaps you should try some spelling variations:
vu khanhh » vu thanh, vu khach, vu hanh
vu khanh » vu thanh, van khanh, duy khanh
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh dai » hanh tai, hanh dao, vanh dai
ky lang » ky dang, ky tang, tay lang
van cac » van hac, van cau, van bac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khanhh) or (vu khanh)) ((ky lang) or (ky nang)) xa hoi. hieu van cac nuoc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khanhh) OR (vu khanh)) ((ky lang) OR (ky nang)) xa hoi. hieu van cac nuoc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khanhh) or (vu khanh)) ((ky lang) or (ky nang)) xa hoi. hieu van cac nuoc va hanh dai cua tre*.