Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
dinh thi » dinh tri
cuoc van » cuoi van, luoc van, quoc van
cac cuoc » cac nuoc, ca cuoc, cac quoc
anh thi » anh tho, dang thi, anh thuc
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
tu can » tu ban, tu cac, thu canh
tu bat » tu ban, tu dat
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 bat) or (tu can)) ky nang o lai. hieu vien cac cuoc van ((anh thi) or (dinh thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bat) OR (tu can)) ky nang o lai. hieu vien cac cuoc van ((anh thi) OR (dinh thi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu bat) or (tu can)) ky nang o lai. hieu vien cac cuoc van ((anh thi) or (dinh thi)) cua tre*.