Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
nuoc van » nuoc va, nuoc san, nuoc dan
thai cua » than cua, tai cuc, tri cua
luoc van » luoc can, luoc va, luc van
cua tre » cua te, cuu tre, cua triet
phu san » phi san, thuy san
hieu ve » hieu va, hieu van
tu bac » tu ban, tu cac, tu bat
nang o » nang co, nang ho, nang ro
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 bac) or (phu san)) ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bac) OR (phu san)) ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu bac) or (phu san)) ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu bac) or (phu san)) ky nang o lai. hieu ve cac ((nuoc van) OR (luoc van)) hanh thai cua tre*.