Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
vao truc » vao thuc, cau truc, dao tuc
vi triet » ve triet, tim triet, va trien
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
hoc hoi » hoc khoi, hoc hoa, hoc noi
doc hoi » duoc hoi, doc hai, doi hoi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va vao » va van, va dao, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang ((doc hoi) or (hoc hoi)). lieu va vao truc va danh va ((vi triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((doc hoi) OR (hoc hoi)). lieu va vao truc va danh va ((vi triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang ((doc hoi) or (hoc hoi)). lieu va vao truc va danh va ((vi triet) OR (va triet))*".