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

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) OR (hieu van)) 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 xa hoi. ((hieu ve) OR (hieu van)) cac luc van hanh ((dieu cua) OR (te cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang xa hoi. ((hieu ve) OR (hieu van)) cac luc van hanh ((dieu cua) or (te cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang xa hoi. ((hieu ve) OR (hieu van)) cac luc van hanh ((dieu cua) or (te cua)) tre*.