Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
tu can » tu ban, tu cac, thu canh
tu san » thu san, tu ban, vu san
tu sac » tu sach, tu cac, tu bac
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 sac) or (((tu san) or (tu can)))) ky nang o lai. hieu ve cac nuoc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (((tu san) OR (tu can)))) ky nang o lai. hieu ve cac nuoc van hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (((tu san) or (tu can)))) ky nang o lai. hieu ve cac nuoc van hanh thai cua tre*.