Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc ban » nuoc san, quoc ban, buoc ban
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, ma hoa, va hoi
me hoi » le hoi

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

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