Perhaps you should try some spelling variations:
dinh thi » dinh tri
cua tre » cua te, cuu tre, cua triet
cac vuc » cac nuoc, cac vung, cac cuoc
anh thi » anh tho, dang thi, anh thuc
vuc van » duc van, luc van, thuc van
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
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 ve cac vuc 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 ve cac vuc 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 ve cac vuc van ((anh thi) or (dinh thi)) cua tre*.