Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dieu cua » dieu tra
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac cuoc
de cua » le cua, te cua
te sai » te tai, te bai, te lai
sai ky » sac ky

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