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