Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
dang van » hoang van, hang va
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
tu van » tu va
ve cac » va cac
va ve » va de, va le, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((lang xa) or (dang van)) hoi. hieu ((ve cac) OR (vien cac)) tu van hanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((lang xa) OR (dang van)) hoi. hieu ((ve cac) OR (vien cac)) tu van hanh va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((lang xa) or (dang van)) hoi. hieu ((ve cac) OR (vien cac)) tu van hanh va ve triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((lang xa) or (dang van)) hoi. hieu ((ve cac) OR (vien cac)) tu van hanh va ve triet*.