Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
dieu cua » dieu tra
nang co » nang cao, nang doc, nang noi
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
te sai » te tai, te bai, te lai
sai ky » sac ky
co hoi » co hoc, co loi
te cua » tue cua, le cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang co hoi. hieu vien cac luc van hanh ((dieu cua) or (te cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang co hoi. hieu vien cac luc van hanh ((dieu cua) OR (te cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sai ky nang co hoi. hieu vien cac luc van hanh ((dieu cua) or (te cua)) tre*.