Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
ban hanh » ban hang
su triet » su viet, su tien, ve triet
bac van » bach van, cac van, tac van
ban van » ban dan, ban va, tan van
nang xa » nang x, lang xa, nang ma
xuc ban » duc ban, cuc ban, quoc ban
ve cac » va cac
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((bac van) or (ban van)) nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ban hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((bac van) OR (ban van)) nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ban hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bac van) or (ban van)) nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ban hanh vi su triet*".