Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
cham luc » cham soc, nhan luc, cham cuu
te sach » toc sach
luc van » luoc van, luu van, duc van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
va cua » va chua, via cua, ma cua
ca cua » co 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 sach y ((nang xa) or (tang van)) hoi. hieu ve cham luc van hanh ((va cua) OR (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (tang van)) hoi. hieu ve cham luc van hanh ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (tang van)) hoi. hieu ve cham luc van hanh ((va cua) OR (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (tang van)) hoi. hieu ve cham luc van hanh ((va cua) OR (ca cua)) tre*.