Perhaps you should try some spelling variations:
ve triet » va trien, su triet
tan hanh » tan thanh, tang hanh, toan hanh
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
cao duc » dao duc, cao suc, giao duc
tu sach » thu sach, su sach, te sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sach 2 » sach y
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: tu sach 2 ((nang xa) OR (lang xa)) hoi. hieu van ((cao duc) or (tao duoc)) tan hanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 ((nang xa) OR (lang xa)) hoi. hieu van ((cao duc) OR (tao duoc)) tan hanh va ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 2 ((nang xa) OR (lang xa)) hoi. hieu van ((cao duc) or (tao duoc)) tan hanh va ve triet*".