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

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

• Performing a fuzzy search may retrieve terms with similar spellings: te lai ky nang co hoi. hieu vien ((cac luc) OR (cac nuoc)) van hanh ((dieu cua) or (te cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te lai ky nang co hoi. hieu vien ((cac luc) OR (cac nuoc)) van hanh ((dieu cua) OR (te cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te lai ky nang co hoi. hieu vien ((cac luc) OR (cac nuoc)) van hanh ((dieu cua) or (te cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te lai ky nang co hoi. hieu vien ((cac luc) OR (cac nuoc)) van hanh ((dieu cua) or (te cua)) tre*.