Perhaps you should try some spelling variations:
ve triet » va trien, su triet
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
sach v » sach va, sach y, sach vay
ve cam » ve cham, ve cac, va cam
sach 2 » sach y
o hoi » co hoi, o hoc, o hai
vi ve » va ve, gi ve, ve ve

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 v) or (sach 2)) nang o hoi. hieu ve cam ((duc ban) OR (duc van)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach v) OR (sach 2)) nang o hoi. hieu ve cam ((duc ban) OR (duc van)) hanh vi ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) or (sach 2)) nang o hoi. hieu ve cam ((duc ban) OR (duc van)) hanh vi ve triet*".