Perhaps you should try some spelling variations:
dua tren » dung tren
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
van anh » van thanh, tuan anh, van minh
anh thi » anh tho, dinh thi, dang thi
thi dua » thi dung
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((o hoi) or (o hai)). hieu ve cac luc van anh thi dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((o hoi) OR (o hai)). hieu ve cac luc van anh thi dua tren*.