Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hieu vien » hieu hien, hieu viec, thieu nien
thai cua » than cua, tai cuc, tri cua
duc manh » suc manh, duc anh, duc minh
vien da » vien dai, hien dai
duc van » duc va, duc tan, duc phan
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
tu bac » tu ban, tu cac, tu bat
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 (tu san)) ky nang o lai. hieu vien da ((duc van) or (duc manh)) nhanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bac) OR (tu san)) ky nang o lai. hieu vien da ((duc van) OR (duc manh)) nhanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu bac) or (tu san)) ky nang o lai. hieu vien da ((duc van) or (duc manh)) nhanh thai cua tre*.