Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
van hanh » van thanh, ban hanh, van anh
do tren » dong tren, duoc tren, do trung
nang xa » lang xa, nang ma, mang xa
kien do » kien doi, bien do, kien de
xuc van » duc van, luc van, vuc van
ve cac » va cac, vien cac
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((nang xa) or (nang x)) hoi. hieu ((ve cam) or (ve cac)) xuc van hanh kien do tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((nang xa) OR (nang x)) hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh kien do tren.
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((nang xa) or (nang x)) hoi. hieu ((ve cam) or (ve cac)) xuc van hanh kien do tren*.